Tim+ wrote:

Mike Clarke wrote:

I think they used to run pairs of motors in parallel on starting and
switch over to series at higher speeds. That was some time ago and I
don't know if they still do.

That description fits with this for older trains.

https://www.whatdotheyknow.com/cy/re...%20Edition.pdf

Indeed so - the old DC machines with series resistors and series/
parallel switching. Simple, but inefficient. Somewhere in the
loft I have a copy of my calculations for the Class 313 notching
curves.

Now slowly passing into history.

Chris
--
Chris J Dixon Nottingham UK


Plant amazing Acers.