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TrainController assumes that a train ready to be started is located with its head near
the exit of its current block. It is also assumed that the train will exit its current block
and enter the next block just after being started. For this reason any speed conditions of
the first block are ignored and the train is accelerated to the speed, which applies in the
second block.
All speed changes take place at the appropriate indicators of the previous block.
When a train enters a block, the Dispatcher checks if there is a route before the next
block. In this case, the route is activated if this has not already been done. If the activation
is not completed when the train reaches the brake or stop indicator in this block
then the train is decelerated or stopped, respectively, in order to wait for the activation
of the route. If there is only one indicator in this block, then the same indicator is used
for indication of entry into the block, activation of the route and braking or stopping. In
this case, the train is always stopped for a short moment because the activation of a
route takes some time.
Such short stops can be avoided by adding at least one additional indicator to the
block in order to indicate block entry and braking or stopping at different locations.
It is possible to use Virtual Contacts for such additional indicators (see section
13.3, “Virtual Contacts”).
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5.8 Arranging Indicators in a Block
This section describes the different types of sensors and how to use them to operate a
block.
Arranging Momentary Track Contacts and Occupancy Sensors in a Block
In the following it is assumed that the track section between the switches in the diagrams
displayed in the previous section is a block. Several methods to arrange indicators
in a block are discussed below. The pros and cons of each method are outlined as
well.