I'm not talking about a Sifa/PZB involuntary stop, but a hit-the-big-red-button emergency braking. I tried this, just for fun, but I could not get the engine going again- specifically, the brake system would not recharge. The BP remained stubbornly at 0. Meanwhile, the MR would slowly lose pressure, until the compressor kicked in and topped it off, just to start going down again. I expect this is what Americans would call an open PCS valve, but I cannot find any way to close it and recharge the brakes. I even tried a full loco shutdown and restart: no dice.