Nominal static geometry check only — no tolerance, kinematic or compliance allowance. See Terms.

Pre-filled from .

Track gauge: — mm  ·  Rail head width: — mm

Body length: — mm  ·  Bogie centres: — mm  ·  Door from centre: — mm  ·  Threshold width: — mm  ·  Threshold height: — mm

Results and schematic update as inputs change.

Track & Platform

m
mm
mm
mm
mm

Vehicle Throw

mm
mm
mm

Door / Platform Interface

mm
mm
mm
mm
mm

Platform Clearance (Body Side to Platform Face)

mm
mm

Positive = gap exists; negative = vehicle body protrudes past platform face.

Formula / method notes

Scope: nominal static geometry only; no dynamic, kinematic, construction, tolerance, compliance, or standards allowance is included.

Plan method: train body is a rigid straight chord between bogie centres on tangent/circular track. Door input is longitudinal distance from vehicle centre and is mirrored at ±x.

Coordinates: x is longitudinal from vehicle centre. u is lateral from track centreline at uncanted rail-top datum. Platform offset is lateral to the platform face.

Cant model: inside rail is low, outside rail is high. Cant rotates section about inside/low rail top using θ = atan(cant/(gauge + rail head width)).

Curve hand mapping: inside/outside engineering sides are mapped to physical left/right display by curve hand only; magnitudes are unchanged by handedness.

Gap outputs: horizontal step gap is from platform face to door threshold edge (main result shown as magnitude). Vertical gap is door threshold RL − platform RL; negative means threshold below platform.