In article ,
Mrs Redboots wrote:
Also there are Class 313s at Clapham Jn (Silverlink metro trains at
Platform 2) - these are very similar to 315s, but can run on the third
rail as well as overhead power supply.

I think I knew that, but never actually noticed it! (I've been on those
trains occasionally).

The change power at a stop. When they go from 3rd rail to overhead,
you can just hear the "thunk" of the pan hitting the wires. I
/think/ the lights brighten just a little, too.

--
Mike Bristow - really a very good driver