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task library
built templatesignal-sightingwith-tool

Overlap Calculation

Calculates a reduced rail signalling overlap distance from approach speed, braking rate, track gradient, reaction time, danger point distance, and low-adhesion factor. The template reports full-speed overlap, braking-only timed overlap, and residual danger point clearance.

inputs

6 fields

context

2 archetypes

engine

with-tool

outputs

6 scored fields

contract fields

Parameter Map

6 inputs to 6 scored outputs

  • maximum_approach_speed_kmh

    float

    Maximum train approach speed

    10 to 160km/h

  • emergency_braking_rate_m_s2

    float

    Emergency braking deceleration rate before adhesion and gradient adjustments

    0.3 to 1.5m/s2

  • track_gradient_pct

    float

    Track gradient, positive for rising grade in the direction of travel

    -4 to 4%

  • reaction_time_s

    float

    Reaction or system allowance time

    0.5 to 5s

  • danger_point_distance_m

    float

    Available distance from stop signal to danger point

    20 to 2000m

  • low_adhesion_factor

    floathidden in hard

    Multiplier applied to braking rate for low adhesion

    0.4 to 1-
approach_speed_m_stol 0.03

Approach speed converted to metres per second

gradient_adjusted_braking_rate_m_s2tol 0.03

Effective braking rate after adhesion and gradient effects

reaction_distance_mtol 0.03

Distance travelled during reaction time

full_speed_overlap_mtol 0.03

Full-speed overlap including reaction and braking distance

timed_overlap_option_mtol 0.03

Braking-only timed overlap distance

danger_point_clearance_mtol 0.03

Residual distance to the danger point after full-speed overlap

visibility contract

Difficulty Ladder

all_giveneasy

Metro overlap case with all values visible

all fields visible
all_givenmedium

Signal overlap case selected from metro or regional lines

all fields visible
partialhard

Regional signal with low adhesion factor embedded in context

low_adhesion_factor

scenario bands

Archetype Atlas

metro_signal

2 contexts

Metro rail signal overlap

maximum_approach_speed_kmh30 to 90
emergency_braking_rate_m_s20.7 to 1.2
track_gradient_pct-2.5 to 2.5
reaction_time_s1 to 3

metro-rail / signal-overlap

regional_signal

2 contexts

Regional rail signal overlap

maximum_approach_speed_kmh70 to 140
emergency_braking_rate_m_s20.5 to 1
track_gradient_pct-3 to 2
reaction_time_s1.5 to 4

regional-rail / signal-overlap

rendered task

Generation Preview

regional-rail-regional-signal-preview

difficulty
hard
visibility
partial
archetype
regional_signal
site context
regional-rail
instruction excerptoverlap-calculation_calc.py

visible fields

  • maximum_approach_speed_kmh70 to 140 km/h
  • emergency_braking_rate_m_s20.5 to 1 m/s2
  • track_gradient_pct-3 to 2 %
  • reaction_time_s1.5 to 4 s
  • danger_point_distance_m300 to 1800 m

withheld schema

low_adhesion_factorapproach_speed_m_sgradient_adjusted_braking_rate_m_s2reaction_distance_mfull_speed_overlap_mtimed_overlap_option_mdanger_point_clearance_m
Regional rail signal overlap. regional-rail. Required outputs: approach_speed_m_s, gradient_adjusted_braking_rate_m_s2, reaction_distance_m, full_speed_overlap_m, timed_overlap_option_m, danger_point_clearance_m