There was one in ME about 30 years ago. Rex Nicholls tram engine. Very simple, just update for more modern components.

<p style=”text-align: left;”>If you dont have coupled axles then wiring motors in series is not ideal. If one axle loses adhesion, it speeds up and it’s back emf goes up. This cuts the current to both the slipping current and it’s series friend.</p>

Hi Phil, if you are located in the north east I may be able to help as I spent quite a bit of my working life designing these controllers

Ed

On 26 September 2024 at 14:39 duncan webster 1 Said:

<p style=”text-align: left;”>If you dont have coupled axles then wiring motors in series is not ideal. If one axle loses adhesion, it speeds up and it’s back emf goes up. This cuts the current to both the slipping current and it’s series friend.</p>

Good point!  It would make driving a lot more exciting though!   Howabout dual wound differential voltage relays lighting a wheel slip indicator bulb?  It is a hobby after all.