Model Railway Signal Project

Download a PDF version of this page: Model Railway Signal Project (PDF)

Railway signal

A magnet under the train operates reed switches positioned on the track. The first reed switch changes the signal to red as the train passes, then further along the track a second reed switch changes the signal back to green ready for the next train. The isolated section of track just in front of the signal is switched off by the relay when the signal is red so a train will stop automatically at the red signal.

This project uses a 555 bistable circuit.

Parts Required

Stripboard Layout

Stripboard layout for model railway signal

Track connections

Track connections for model railway signal

Circuit diagram

Circuit diagram for model railway signal