Krikey, you weren't kidding.  At least you don't give up easy.

I would place a classic linear unregulated supply, with filament xformer,
big bridge, and big cap, in front of the circuit for each car.  Then add
a MOSFET based switcher to regulate current through the track line.  The
linear front end will be forgiving of peak currents, and the switcher
will account for voltage variation and track resistance.  And hopefully
waste will be kept down to 1000 watts per.

Ask Andrew:  is there a standard way to do this in general practice?

Chris Eddy

Quentin wrote:

> OK, to get this OT topic back to topic, yet still OT. :)
> Confirmed that the amps needed is 4-8A peaking to 15A. The track only
> got 6 slots (not 16). Still a lot of power.
> Anybody got an idea for a no nonsense PSU for them?
>
> Thanks
> Quentin