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[email protected] · December 20th 17, 04:45 PM posted to uk.railway,uk.transport.london

On 19.12.17 19:54, Clive D.W. Feather wrote:
In article ,
writes
Is there nothing that will force a pan drop?

If it rises too high, it will drop automatically.

I don't think there's any stock where the automatic power control
magnets drop the pan - they just trip the main breaker instead.

One Metro-North, for example, the M2 runs dual-mode DC on 3rd rail and
AC under the wire. I assume that the same happens with the newer M8.

As soon as that train's shoes come into contact with live 3rd rail, the
pantographs automatically come down.

What about in the reverse direction? You want the pan to come up while
in the transition area.

Nope, got to set the mode switch and manually raise them. Pans will also
not go up if any part of the train is on contact with the 3rd rail.