"Jack Taylor" wrote in message
...

"Robin Mayes" wrote in message
.. .

There's no way to 'lock out' carriages. You can stop the passenger doors
from opening on one car but people will just use the interconnecting
door
to
access it anyway.

I'm well aware of that - but actually trying is better than nothing at
all.

You can't on 72 stock. So it's either in service or not. The guys were
probably checking for repeating line breakers (someone else explain) by the
sounds of things