Track circuit
part · 1872 · Electric age
An electric circuit through the rails that detects a train (Robinson).
Inventor: William Robinson.
What it is made of
- Relay — has part. Track relays.
Principles and materials it uses
- Electrical conduction — uses. The wheelset closes the circuit.
- Steel — is made of. The current runs through the steel rails.
Where it is used
- Automatic block signalling — is part of. Track circuits.