the value of deceleration γe obtained by dividing the difference of the squares of the initial and final speeds by twice the distance travelled while the reduction of speed is taking place :
where:
l is the distance between the position of the train or vehicle at the moment of the operation of the brake control and its position when the final speed is attained ;
Vi is the initial speed measured at the moment of operation of the control device for the brake ;
Vt is the final speed obtained at the end of the braking
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