[Serana]

Hi,

On Corail cars, it's not an EP braking system.

An electropneumatic brake means that braking orders are sent as electrical signals (for example, PWM signals). Then, valves are used to command the pressure in the cylinders. There's no brake pipe, there's only a supply pipe.

On Corail cars (and any other trains that run at a speed above 140 km/h with an UIC braking system in France), there is an electrical assistance to the pneumatic brake (called FEP).
There are both a brake pipe and a supply pipe (the ones of the double-pipe braking system).
The assistance is composed of two valves on each car that are commanded by the locomotive. One is used to fill the brake pipe (using air from the supply pipe), the other one is used to empty the brake pipe. This system is disabled on Emergency Braking.
Indeed, if the assistance is not available, the train speed is limited to 140 km/h.

In OR, it looks like it is the first system that is used (a cylinder pressure command is sent to each car by the brake controller).

For a Corail car, a twin pipe system should be used while the assistance isn't coded.