Model Railroad Electronic Circuits
- Easy electronic circuits you can build, including crossing flasher, constant directional lighting, train detectors, and power supplies. Provided by Mark Rollins.
- http://www.mrollins.com/circuit.html

Model Railroad Electronics
- Electronic circuits for use on a model railroads including -crossing light flashers, block occupancy detectors, train position detectors, simple signals, throttles, switch machines and automatic reverse loop circuits.
- http://home.cogeco.ca/~rpaisley4/CircuitIndex.html