TrainController Gold and Silver - Freiwald Software

the block. There is also a disadvantage for passing trains. Let us assume that a train is
passing the block from the left to the right and that a route is to be activated before the
block ahead, to the right of this block. As soon as the passing train enters the block at A
the route is activated. In the same moment the train begins to slow down, because A defines
also a brake marker and the train has to wait, until the route is reported to be activated
which takes time. This could be avoided by adding an additional contact as shown
in the following diagram:
Diagram 108: Block with three momentary sensors
In Diagram 108 the indicator A defines a stop marker for trains running to the left, C
acts as stop marker for trains running to the right. Indicator B is marked with brake
markers for trains running in both directions. In this configuration block occupancy is
not indicated, too, and as in Diagram 107 certain measures are to be taken to avoid
premature reservation of this block for another train when a train leaves this block. But
trains can pass this block without any speed changes, even if there is a route to be activated
before the block ahead – provided the distance between A and B or C and B, respectively,
is large enough such that the route can be activated after passing A or C, respectively,
and before reaching B.
All examples discussed so far can be applied for blocks passed by trains in both directions.
The configuration can be made simpler if trains pass a block only in one direction.
This is shown in the following:
Diagram 109: Block with two occupancy sensors
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