In article ,
Robin Mayes wrote:

"Boltar" wrote in message
oups.com...
keys. The hissing noise would be the air venting to atmosphere when
the train is shut down, therefore locking the brakes on, and when the

If this locks the brakes on how are trains towed dead if they fail?

Brake release valves.

Are those the inside cantrail BRV stickers ? I always assumed it was
the Brake Reducing Valve for the EP brake, but yours sounds plausible.

Nick
--
http://www.leverton.org/ ... So express yourself