Basics of Railway Signaling
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By Somnath Banerjee
Braking Distance Calculator

Calculation of train braking distance is very important in design of Railway control systems. To determine train seperation within a Railway network train braking distances are calculated. No train should have any obstacle within its braking distance to avoid hazard. Train braking distance depends on the velocity at which a train is travelling, the rate of deceleration or braking rate the train has, gradient of the track.

The tool below can calculate the braking distance using these parameters. Values in the text boxes are shown as example. Change them and click Calculate button at the end of the form to find new braking distance suiting your circumstances.

Chainage at target
m.
This is the chainage of the point where the train is to come to a stop or controlled.
Chainage in Rear
m.
This is the chainage of the gradient post/ speed post immediately in rear of the point where the train is required to be stopped or controlled
Gradient in rear 1 in
The gradient applicable to the gradient/ speed post immediately in rear. Uphill gradients are to be shown as positive and downhill as negative when referred to the direction of travel.
Speed in rear chainage
m/sec.
The speed applicable to the gradient/ speed post immediately in rear
Speed at target
m/sec.
The speed to be achieved at the point where the train is required to be stopped or controlled. This will be zero if the train is to be stopped.
Trainbrakerate
m/ sec sq.
This is the deceleration rate generally between 0.25 to 0.8.
Trainaccrate
m/ sec sq.
This is the acceleration rate generally between 0.25 to 0.8.

By clicking the calculate button I agree to the terms and conditions included at the bottom of this form.


Disclaimer

The use of the tool for failsafe application is subject to independent validation by the user organization";