Mike,
Simple transistor throttles and power supplies like the ones discribed in the Kalmbach book "Practical Electronic Projects for Model Railroaders" by Peter Thorne would work fine and will give good control with todays modern low current motors.
If you have access to a good library of model mags, you can do a search of the magazine index on Kalmbach's web site and find dozens more circuits that have published over the years.
Sheldon
Simple transistor throttles and power supplies like the ones discribed in the Kalmbach book "Practical Electronic Projects for Model Railroaders" by Peter Thorne would work fine and will give good control with todays modern low current motors.
If you have access to a good library of model mags, you can do a search of the magazine index on Kalmbach's web site and find dozens more circuits that have published over the years.
Sheldon