Editing Cab signalling (section)

=== Inductive ===
[[Inductive sensor|Inductive systems]] are non-contact systems that rely on more than the simple presence or absence of a magnetic field to transmit a message. Inductive systems typically require a beacon or an [[induction loop]] to be installed at every signal and other intermediate locations. The inductive coil uses a changing magnetic field to transmit messages to the train. Typically, the frequency of pulses in the inductive coil are assigned different meanings.  Continuous inductive systems can be made by using the running rails as one long tuned inductive loop.

Examples of intermittent inductive systems include the German [[Indusi]] system.  Continuous inductive systems include the two-aspect [[General Railway Signal]] Company "Automatic Train Control" installed on the [[Chicago and North Western Railroad]] among others.