Please READ MORE for the video. Braking physics related with brake shoe friction ratio (K, L etc.) and vertical force of them (to the wheel bandage or disk or rail). Brake system ensure negative force when activate and rail-wheel contact force (adhesion) must resist to brake force. So, wheel rail contact force and furthermore, vertical force of vehicle is important parameter for braking.
Braking test regulation: EN13452
Some braking technologies...
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