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electricalwith-tool

Level Crossing Warning Backup Power Package

Calculates source-bound rail level-crossing metrics from a deterministic SSC-02 task-owned source pack. The template combines warning time and strike-in distance, active-control and communications load, UPS and battery autonomy, DC feeder voltage drop, fiber link margin, and an overall synthetic pass score.

with-tool: The model is given an executable Python calculator script.

Standards

49 CFR Part 234 AREMA C&S Manual route FHWA MUTCD Part 8 operator level-crossing workflow

How this task is generated

One template produces many comparable benchmark tasks while keeping the scoring contract fixed.

01
Template
The reusable contract shown on this page.
02
Scenario
An archetype and site context are sampled.
03
Difficulty tier
Inputs may be hidden at harder tiers.
04
Task prompt
The model responds with the declared outputs.

Parameters

Inputs the model receives, and the outputs it is scored on.

Inputs

38 inputs

Always given

Included directly in every task prompt.

Show 38 inputs

Maximum train speed kmh
maximum_train_speed_kmh
WT-02-WARN-01 controlling approach train speed
80 km/h
Minimum warning time
minimum_warning_time_s
WT-02-WARN-01 minimum warning time criterion
20 s
Road user clearance time
road_user_clearance_time_s
WT-02-WARN-01 road-user clearance allowance
7 s
Gate lowering time
gate_lowering_time_s
CTRL-02-XING-01 gate lowering time
11 s
System delay
system_delay_s
WT-02-WARN-01 controller and detection delay
2 s
Gate start delay
gate_start_delay_s
CTRL-02-XING-01 delay from warning start to gate descent
3 s
Required gate horizontal before arrival
required_gate_horizontal_before_arrival_s
OPS-02-DEGRADED-01 required time with gates horizontal before train arrival
5 s
Controller load
controller_load_w
LOAD-02-SIG-01 crossing controller load
180 W
Flashing light load
flashing_light_load_w
LOAD-02-SIG-01 load per flashing-light assembly
40 W
Flashing light count
flashing_light_count
LX-02-LAYOUT-01 flashing-light assembly count
4
Gate mechanism load
gate_mechanism_load_w
LOAD-02-SIG-01 load per gate mechanism
90 W
Gate mechanism count
gate_mechanism_count
LX-02-LAYOUT-01 gate mechanism count
2
Comms switch load
comms_switch_load_w
LOAD-02-SIG-01 communications switch load
45 W
Track circuit load
track_circuit_load_w
LOAD-02-SIG-01 track circuit and detector load
65 W
Event recorder load
event_recorder_load_w
LOAD-02-SIG-01 event recorder load
25 W
Load future allowance pct
load_future_allowance_pct
LOAD-02-SIG-01 spare and future allowance
10 %
Required autonomy
required_autonomy_h
BATT-02-UPS-01 degraded-mode autonomy requirement
8 h
Dc system voltage
dc_system_voltage_v
BATT-02-UPS-01 DC system voltage
48 V
Depth of discharge pct
depth_of_discharge_pct
BATT-02-UPS-01 usable battery depth of discharge
80 %
Temperature derating factor
temperature_derating_factor
BATT-02-UPS-01 temperature derating factor
0.85
Inverter efficiency pct
inverter_efficiency_pct
BATT-02-UPS-01 inverter efficiency
92 %
Installed battery capacity
installed_battery_capacity_ah
BATT-02-UPS-01 installed battery capacity
200 Ah
Battery block voltage
battery_block_voltage_v
BATT-02-UPS-01 battery block voltage
12 V
Load power factor
load_power_factor
BATT-02-UPS-01 UPS load power factor
0.9
Selected ups rating
selected_ups_rating_va
BATT-02-UPS-01 selected UPS rating
900 VA
Feeder length
feeder_length_m
FEEDER-02-DC-01 two-wire DC feeder one-way length
30 m
Feeder resistance milliohm per m
feeder_resistance_milliohm_per_m
FEEDER-02-DC-01 conductor resistance
1.83 milliohm/m
Max voltage drop percent
max_voltage_drop_percent
FEEDER-02-DC-01 maximum DC feeder voltage drop
5 %
Fiber length
fiber_length_km
FIBER-02-COMMS-01 fiber link length
1.8 km
Fiber attenuation db per km
fiber_attenuation_db_per_km
FIBER-02-COMMS-01 fiber attenuation
0.35 dB/km
Fiber connector count
fiber_connector_count
FIBER-02-COMMS-01 connector count
4
Connector loss
connector_loss_db
FIBER-02-COMMS-01 connector loss
0.3 dB
Fiber splice count
fiber_splice_count
FIBER-02-COMMS-01 splice count
6
Splice loss
splice_loss_db
FIBER-02-COMMS-01 splice loss
0.05 dB
Patch panel allowance
patch_panel_allowance_db
FIBER-02-COMMS-01 patch-panel allowance
1 dB
Optical tx power
optical_tx_power_dbm
FIBER-02-COMMS-01 optical transmitter power
-3 dBm
Receiver sensitivity
receiver_sensitivity_dbm
FIBER-02-COMMS-01 receiver sensitivity
-24 dBm
Required fiber margin
required_fiber_margin_db
FIBER-02-COMMS-01 required optical margin
3 dB

Scored outputs

22 outputs

Maximum train speed m s

maximum_train_speed_m_s

WT-02-WARN-01 controlling approach speed converted to m/s

Scores if within ±3% of the reference value.

Total warning time s

total_warning_time_s

Total warning time including minimum warning, clearance, gate lowering, and system delay

Scores if within ±3% of the reference value.

Strike in distance

strike_in_distance_m

WT-02-WARN-01 strike-in distance for the controlling approach

Scores if within ±3% of the reference value.

Minimum warning margin s

minimum_warning_margin_s

Total warning time minus the minimum warning criterion

Scores if within ±3% of the reference value.

Gate horizontal margin s

gate_horizontal_margin_s

Time margin after gate start delay, lowering, and required horizontal-before-arrival time

Scores if within ±3% of the reference value.

Connected signal load w

connected_signal_load_w

Connected crossing control, warning-device, communications, and recorder load

Scores if within ±3% of the reference value.

Design signal load w

design_signal_load_w

Connected signal load plus future allowance

Scores if within ±3% of the reference value.

Required energy kwh

required_energy_kwh

Backup energy required for degraded-mode autonomy

Scores if within ±3% of the reference value.

Required battery capacity ah

required_battery_capacity_ah

Required battery capacity after DOD, temperature, and inverter derating

Scores if within ±3% of the reference value.

Battery capacity margin ah

battery_capacity_margin_ah

Installed battery capacity minus required battery capacity

Scores if within ±3% of the reference value.

Required ups rating va

required_ups_rating_va

Required UPS apparent power rating at the source-owned power factor

Scores if within ±3% of the reference value.

Ups rating margin va

ups_rating_margin_va

Selected UPS rating minus required UPS rating

Scores if within ±3% of the reference value.

Battery block count

battery_block_count

Battery block count needed to reach the DC system voltage

Scores if within ±0.1% of the reference value.

Dc feeder current

dc_feeder_current_a

FEEDER-02-DC-01 DC current at design signal load

Scores if within ±3% of the reference value.

Dc feeder voltage drop

dc_feeder_voltage_drop_v

Two-wire DC feeder voltage drop

Scores if within ±3% of the reference value.

Dc feeder voltage drop

dc_feeder_voltage_drop_percent

Two-wire DC feeder voltage drop percentage

Scores if within ±3% of the reference value.

Dc voltage drop margin

dc_voltage_drop_margin_percent

Maximum voltage drop percent minus calculated voltage drop percent

Scores if within ±3% of the reference value.

Fiber total loss db

fiber_total_loss_db

Total fiber attenuation, connector, splice, and patch-panel loss

Scores if within ±3% of the reference value.

Fiber receive power dbm

fiber_receive_power_dbm

Estimated optical receive power

Scores if within ±3% of the reference value.

Fiber link margin db

fiber_link_margin_db

Receive power minus receiver sensitivity

Scores if within ±3% of the reference value.

Fiber excess margin db

fiber_excess_margin_db

Fiber link margin minus required margin

Scores if within ±3% of the reference value.

Overall pass score

overall_pass_score

1.0 when warning, gate, battery, UPS, voltage-drop, and fiber margins are non-negative

Scores if within ±0.1% of the reference value.

Difficulty

Each template is sampled at three tiers. Harder tiers may hide inputs, forcing the model to infer them from the scenario description.

All inputs remain visible at every tier

For this template, difficulty scales through parameter and scenario ranges rather than hidden information.

easy:: All source-pack values given for the SSC-02 level-crossing warning and backup-power package
medium:: All source-pack values given for the SSC-02 level-crossing warning and backup-power package
hard:: All source-pack values given for the SSC-02 level-crossing warning and backup-power package

Task bundle

The exact instruction and parameter contract used to generate this task, pinned to the published library source.

/workspace

instruction.md
level-crossing-warning-backup-power-package_calc.py

Teal lines show Jinja input conditions, not task visibility policy. A line renders only when that input or tool is visible.

1You are an electrical and rail systems engineer checking a task-owned synthetic SSC-02 level-crossing warning-time, backup-power, DC feeder, and fiber communications package.2 3Use only the task-owned synthetic source pack values shown below for numeric grading. 49 CFR Part 234, FHWA MUTCD Part 8, AREMA C&S Manual routes, and operator level-crossing workflows shape the context only; this instance does not run signalling design software, parse real signal plans, verify an authority standard, or prove full rail safety compliance.4 5## Scene6 7- Design case: `CASE-SSC02-LX-001`8- Route profile: `ROUTE-02-PROFILE-01`9- Level crossing layout: `LX-02-LAYOUT-01`10- Warning-time worksheet: `WT-02-WARN-01`11- Crossing controller: `CTRL-02-XING-01`12- Signal and communications load schedule: `LOAD-02-SIG-01`13- Battery and UPS datasheet: `BATT-02-UPS-01`14- DC feeder schedule: `FEEDER-02-DC-01`15- Fiber communications link: `FIBER-02-COMMS-01`16- Degraded-mode operating note: `OPS-02-DEGRADED-01`17- Engineering memo: `MEMO-02-LX-OPS-01`18 19## Warning-Time And Gate Basis20 21| Item | Value |22|------|-------|23| Controlling approach speed | {{ maximum_train_speed_kmh }} km/h |24| Minimum warning time | {{ minimum_warning_time_s }} s |25| Road-user clearance time | {{ road_user_clearance_time_s }} s |26| Gate lowering time | {{ gate_lowering_time_s }} s |27| System delay | {{ system_delay_s }} s |28| Delay from warning start to gate descent | {{ gate_start_delay_s }} s |29| Required gate-horizontal time before arrival | {{ required_gate_horizontal_before_arrival_s }} s |30 31Warning checks:32 33- Maximum train speed in m/s equals `maximum_train_speed_kmh / 3.6`.34- Total warning time equals `minimum_warning_time_s + road_user_clearance_time_s + gate_lowering_time_s + system_delay_s`.35- Strike-in distance equals maximum train speed in m/s times total warning time.36- Minimum warning margin equals total warning time minus minimum warning time.37- Gate-horizontal margin equals total warning time minus gate start delay, gate lowering time, and required gate-horizontal time before arrival.38 39## Signal Load And Backup-Power Basis40 41| Item | Value |42|------|-------|43| Crossing controller load | {{ controller_load_w }} W |44| Flashing-light load per assembly | {{ flashing_light_load_w }} W |45| Flashing-light assembly count | {{ flashing_light_count }} |46| Gate mechanism load per mechanism | {{ gate_mechanism_load_w }} W |47| Gate mechanism count | {{ gate_mechanism_count }} |48| Communications switch load | {{ comms_switch_load_w }} W |49| Track circuit and detector load | {{ track_circuit_load_w }} W |50| Event recorder load | {{ event_recorder_load_w }} W |51| Load future allowance | {{ load_future_allowance_pct }} % |52| Required autonomy | {{ required_autonomy_h }} h |53| DC system voltage | {{ dc_system_voltage_v }} V |54| Depth of discharge | {{ depth_of_discharge_pct }} % |55| Temperature derating factor | {{ temperature_derating_factor }} |56| Inverter efficiency | {{ inverter_efficiency_pct }} % |57| Installed battery capacity | {{ installed_battery_capacity_ah }} Ah |58| Battery block voltage | {{ battery_block_voltage_v }} V |59| UPS load power factor | {{ load_power_factor }} |60| Selected UPS rating | {{ selected_ups_rating_va }} VA |61 62Load and backup-power checks:63 64- Connected signal load equals controller load, flashing-light load times count, gate-mechanism load times count, communications switch load, track-circuit load, and event-recorder load.65- Design signal load equals connected signal load times `(1 + load_future_allowance_pct / 100)`.66- Required energy equals `design_signal_load_w x required_autonomy_h / 1000`.67- Usable battery fraction equals `depth_of_discharge_pct / 100 x temperature_derating_factor x inverter_efficiency_pct / 100`.68- Required battery capacity equals `design_signal_load_w x required_autonomy_h / (dc_system_voltage_v x usable battery fraction)`.69- Battery capacity margin equals installed battery capacity minus required battery capacity.70- Required UPS rating equals `design_signal_load_w / load_power_factor`.71- UPS rating margin equals selected UPS rating minus required UPS rating.72- Battery block count equals `ceil(dc_system_voltage_v / battery_block_voltage_v)`.73 74## DC Feeder And Fiber Basis75 76| Item | Value |77|------|-------|78| DC feeder one-way length | {{ feeder_length_m }} m |79| Feeder resistance | {{ feeder_resistance_milliohm_per_m }} milliohm/m |80| Maximum DC feeder voltage drop | {{ max_voltage_drop_percent }} % |81| Fiber length | {{ fiber_length_km }} km |82| Fiber attenuation | {{ fiber_attenuation_db_per_km }} dB/km |83| Fiber connector count | {{ fiber_connector_count }} |84| Connector loss | {{ connector_loss_db }} dB |85| Fiber splice count | {{ fiber_splice_count }} |86| Splice loss | {{ splice_loss_db }} dB |87| Patch-panel allowance | {{ patch_panel_allowance_db }} dB |88| Optical transmitter power | {{ optical_tx_power_dbm }} dBm |89| Receiver sensitivity | {{ receiver_sensitivity_dbm }} dBm |90| Required fiber margin | {{ required_fiber_margin_db }} dB |91 92Feeder and fiber checks:93 94- DC feeder current equals `design_signal_load_w / dc_system_voltage_v`.95- DC feeder voltage drop equals `2 x dc_feeder_current_a x feeder_length_m x feeder_resistance_milliohm_per_m / 1000`.96- DC feeder voltage drop percent equals `dc_feeder_voltage_drop_v / dc_system_voltage_v x 100`.97- DC voltage-drop margin equals maximum voltage drop percent minus DC feeder voltage drop percent.98- Fiber total loss equals fiber length attenuation plus connector, splice, and patch-panel losses.99- Fiber receive power equals optical transmitter power minus fiber total loss.100- Fiber link margin equals fiber receive power minus receiver sensitivity.101- Fiber excess margin equals fiber link margin minus required fiber margin.102- Overall pass score is `1.0` only when minimum warning margin, gate-horizontal margin, battery capacity margin, UPS rating margin, DC voltage-drop margin, and fiber excess margin are all non-negative; otherwise it is `0.0`.103 104## Output Format105 106Write a compact memo to `/workspace/output.md`. Include a source-boundary statement that this is a task-owned synthetic source pack. Explain the calculations briefly, preserve the object IDs above, and state whether the baseline source pack passes the current docs-only checks.107 108Do not claim authority approval, accepted project evidence, software export validity, full standards compliance, executable real source-pack parsing, generated signalling-software evidence, generated benchmark readiness, or benchmark readiness.109 110Include a fenced JSON block with exactly these numeric keys:111 112```json113{114  "maximum_train_speed_m_s": <numeric_value>,115  "total_warning_time_s": <numeric_value>,116  "strike_in_distance_m": <numeric_value>,117  "minimum_warning_margin_s": <numeric_value>,118  "gate_horizontal_margin_s": <numeric_value>,119  "connected_signal_load_w": <numeric_value>,120  "design_signal_load_w": <numeric_value>,121  "required_energy_kwh": <numeric_value>,122  "required_battery_capacity_ah": <numeric_value>,123  "battery_capacity_margin_ah": <numeric_value>,124  "required_ups_rating_va": <numeric_value>,125  "ups_rating_margin_va": <numeric_value>,126  "battery_block_count": <numeric_value>,127  "dc_feeder_current_a": <numeric_value>,128  "dc_feeder_voltage_drop_v": <numeric_value>,129  "dc_feeder_voltage_drop_percent": <numeric_value>,130  "dc_voltage_drop_margin_percent": <numeric_value>,131  "fiber_total_loss_db": <numeric_value>,132  "fiber_receive_power_dbm": <numeric_value>,133  "fiber_link_margin_db": <numeric_value>,134  "fiber_excess_margin_db": <numeric_value>,135  "overall_pass_score": <numeric_value>136}137```138

Scenario archetypes

Each generated task is drawn from one of these realistic scenario bands.

Site contexts ground each scenario in a real locale the model can use to infer hidden values.

Ssc02 level crossing backup case

ssc02_level_crossing_backup_case

One route-profile level crossing tied to warning-time, signalling load, backup supply, DC feeder, fiber link, and degraded-mode memo

level-crossing-warning-backup

Parameter ranges

maximum_train_speed_kmh: 80
minimum_warning_time_s: 20
road_user_clearance_time_s: 7
gate_lowering_time_s: 11
system_delay_s: 2
gate_start_delay_s: 3
required_gate_horizontal_before_arrival_s: 5
controller_load_w: 180
flashing_light_load_w: 40
flashing_light_count: 4
gate_mechanism_load_w: 90
gate_mechanism_count: 2
comms_switch_load_w: 45
track_circuit_load_w: 65
event_recorder_load_w: 25
load_future_allowance_pct: 10
required_autonomy_h: 8
dc_system_voltage_v: 48
depth_of_discharge_pct: 80
temperature_derating_factor: 0.85
inverter_efficiency_pct: 92
installed_battery_capacity_ah: 200
battery_block_voltage_v: 12
load_power_factor: 0.9
selected_ups_rating_va: 900
feeder_length_m: 30
feeder_resistance_milliohm_per_m: 1.83
max_voltage_drop_percent: 5
fiber_length_km: 1.8
fiber_attenuation_db_per_km: 0.35
fiber_connector_count: 4
connector_loss_db: 0.3
fiber_splice_count: 6
splice_loss_db: 0.05
patch_panel_allowance_db: 1
optical_tx_power_dbm: -3
receiver_sensitivity_dbm: -24
required_fiber_margin_db: 3

Example task

level-crossing-warning-backup-ssc02-level-crossing-backup-case-preview — hard difficulty, all inputs given.

One route-profile level crossing tied to warning-time, signalling load, backup supply, DC feeder, fiber link, and degraded-mode memo. level-crossing-warning-backup. Required outputs: maximum_train_speed_m_s, total_warning_time_s, strike_in_distance_m, minimum_warning_margin_s, gate_horizontal_margin_s, connected_signal_load_w

The model sees

Scenario context and visible inputs.

maximum_train_speed_kmh: 80 to 80 km/h
minimum_warning_time_s: 20 to 20 s
road_user_clearance_time_s: 7 to 7 s
gate_lowering_time_s: 11 to 11 s
system_delay_s: 2 to 2 s
gate_start_delay_s: 3 to 3 s
required_gate_horizontal_before_arrival_s: 5 to 5 s
controller_load_w: 180 to 180 W
flashing_light_load_w: 40 to 40 W
flashing_light_count: 4 to 4
gate_mechanism_load_w: 90 to 90 W
gate_mechanism_count: 2 to 2
comms_switch_load_w: 45 to 45 W
track_circuit_load_w: 65 to 65 W
event_recorder_load_w: 25 to 25 W
load_future_allowance_pct: 10 to 10 %
required_autonomy_h: 8 to 8 h
dc_system_voltage_v: 48 to 48 V
depth_of_discharge_pct: 80 to 80 %
temperature_derating_factor: 0.85 to 0.85
inverter_efficiency_pct: 92 to 92 %
installed_battery_capacity_ah: 200 to 200 Ah
battery_block_voltage_v: 12 to 12 V
load_power_factor: 0.9 to 0.9
selected_ups_rating_va: 900 to 900 VA
feeder_length_m: 30 to 30 m
feeder_resistance_milliohm_per_m: 1.83 to 1.83 milliohm/m
max_voltage_drop_percent: 5 to 5 %
fiber_length_km: 1.8 to 1.8 km
fiber_attenuation_db_per_km: 0.35 to 0.35 dB/km
fiber_connector_count: 4 to 4
connector_loss_db: 0.3 to 0.3 dB
fiber_splice_count: 6 to 6
splice_loss_db: 0.05 to 0.05 dB
patch_panel_allowance_db: 1 to 1 dB
optical_tx_power_dbm: -3 to -3 dBm
receiver_sensitivity_dbm: -24 to -24 dBm
required_fiber_margin_db: 3 to 3 dB

Executable tool: level-crossing-warning-backup-power-package_calc.py

The model must infer

Inputs withheld at this difficulty.

Nothing. All inputs are supplied.

The model must produce

The scored JSON answer schema.

{
  "maximum_train_speed_m_s": <number>,
  "total_warning_time_s": <number>,
  "strike_in_distance_m": <number>,
  "minimum_warning_margin_s": <number>,
  "gate_horizontal_margin_s": <number>,
  "connected_signal_load_w": <number>,
  "design_signal_load_w": <number>,
  "required_energy_kwh": <number>,
  "required_battery_capacity_ah": <number>,
  "battery_capacity_margin_ah": <number>,
  "required_ups_rating_va": <number>,
  "ups_rating_margin_va": <number>,
  "battery_block_count": <number>,
  "dc_feeder_current_a": <number>,
  "dc_feeder_voltage_drop_v": <number>,
  "dc_feeder_voltage_drop_percent": <number>,
  "dc_voltage_drop_margin_percent": <number>,
  "fiber_total_loss_db": <number>,
  "fiber_receive_power_dbm": <number>,
  "fiber_link_margin_db": <number>,
  "fiber_excess_margin_db": <number>,
  "overall_pass_score": <number>
}

maximum_train_speed_m_s · scored within ±3%
total_warning_time_s · scored within ±3%
strike_in_distance_m · scored within ±3%
minimum_warning_margin_s · scored within ±3%
gate_horizontal_margin_s · scored within ±3%
connected_signal_load_w · scored within ±3%
design_signal_load_w · scored within ±3%
required_energy_kwh · scored within ±3%
required_battery_capacity_ah · scored within ±3%
battery_capacity_margin_ah · scored within ±3%
required_ups_rating_va · scored within ±3%
ups_rating_margin_va · scored within ±3%
battery_block_count · scored within ±0.1%
dc_feeder_current_a · scored within ±3%
dc_feeder_voltage_drop_v · scored within ±3%
dc_feeder_voltage_drop_percent · scored within ±3%
dc_voltage_drop_margin_percent · scored within ±3%
fiber_total_loss_db · scored within ±3%
fiber_receive_power_dbm · scored within ±3%
fiber_link_margin_db · scored within ±3%
fiber_excess_margin_db · scored within ±3%
overall_pass_score · scored within ±0.1%

Level Crossing Warning Backup Power Package

How this task is generated

Template

Scenario

Difficulty tier

Task prompt

Parameters

Inputs

Scored outputs

Maximum train speed m s

Total warning time s

Strike in distance

Minimum warning margin s

Gate horizontal margin s

Connected signal load w

Design signal load w

Required energy kwh

Required battery capacity ah

Battery capacity margin ah

Required ups rating va

Ups rating margin va

Battery block count

Dc feeder current

Dc feeder voltage drop

Dc feeder voltage drop

Dc voltage drop margin

Fiber total loss db

Fiber receive power dbm

Fiber link margin db

Fiber excess margin db

Overall pass score

Difficulty

All inputs remain visible at every tier

Task bundle

Scenario archetypes

Ssc02 level crossing backup case

Example task

The model sees

The model must infer

The model must produce