[glend (Glen)]

Originally Posted by glend

There are many reduction gear electric motors that could work. Electric bikes are actually governed for low speed, something like this could be made to work:

https://www.ebay.com.au/i/223988350418?chn=ps

You could use a simple PWM motor controller rated for the motor, like this one,

https://www.ebay.com.au/i/112713952838?chn=ps

There are plenty of PWMs to choose from. Install a cutout switch near the end of the run to trip. Now reversing it will require a bit of thought.