TrainController Gold and Silver - Freiwald Software

tain track section. In Diagram 85 to Diagram 88 you can see an occupancy sensor
turned on and off by a passing train. Occupancy sensors are able to report the presence
of a train inside a certain track section even if the train is not moving. Momentary contacts
are triggered by moving trains only. Momentary contacts can be made for instance
by mechanical track contacts, reed contacts or optical sensors. Occupancy sensors are
often based on current sensing in isolated track sections.
Unlike other programs which require occupancy sensors for automatic train control
TrainController is also able to control trains if only momentary track contacts are
used. Occupancy sensors are safer, though, because with momentary contacts special
measures against premature release of blocks and routes must be taken.
The following diagrams show the behavior of a momentary contact in the different
phases while a train is passing. The position of the momentary contact is marked with a
short vertical line.
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Diagram 82: Train is approaching the momentary contact – the contact is turned off
Diagram 83: Train is reaching the momentary contact – the contact is triggered