Astea cred că sunt.

"Coaches have a tendency to climb on top of each other in a collision accident," says Vacas de Carvalho, "which is very dangerous for the passenger. In the United States, 'anti-climbers' are compulsory for avoiding overriding, and we aim to include these in all trains across Europe."
http://ec.europa.eu/research/growth/gcc/projects/safe-train....


Anti-climbers

To protect the crew and passengers, most modern locomotives and passenger cars are fitted with a device known as an anti-climber above the coupler to prevent colliding objects from travelling up over the frame and through the locomotive cab area or through the passenger car. Where a pilot is not fitted, a different type of anti-climber may be used. This is to prevent one passenger car from riding up over another, or telescoping in a collision.
http://en.wikipedia.org/wiki/Anticlimber#Anti-climbers

In a railway accident, telescoping occurs when the underframe of one vehicle overrides that of another, and smashes through the second vehicle's body.

To reduce the chance of telescoping, rail and tramway vehicles are often provided with an anticlimber: a horizontally ridged plate at the end of the chassis, which in a collision will engage with the anticlimber on the next car.
http://en.wikipedia.org/wiki/Telescoping_(railway)