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Diagram 94 has been derived from Diagram 90 by eliminating sensor A. It is assumed
that the block is only passed from the left to the right. B acts as brake indicator and C as
stop indicator for trains running to the right.
The different configurations discussed in this section are only examples. Configurations
similar to Diagram 94 or Diagram 140 can also be made with momentary contacts instead
of occupancy sensors or with a mixture of both types similar to Diagram 91. One
can think also of other configurations. There is no best way to setup a block. The optimal
solution does not only depend on technical requirements but also which equipment
you already got and how much you want to spend for new equipment.
In most of the examples discussed in the following sections blocks are represented
only by one single indicator. This is done for reasons of simplicity. On an actual
layout a block will almost always contain more than one indicator in one of the
configurations discussed above.
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One Sensor per Block: Combined Brake/Stop Indicators
For your convenience it is possible to replace certain contacts by combined brake/stop
indicators. Assume the following configuration:
A
B
Diagram 95: Block with a combined brake/stop indicator
If your trains are running very precisely, then it is not necessary to mark the stop points
A and C with separate indicators. Instead it is possible to specify the occupancy sensor
B as combined brake/stop indicator for both directions. A combined brake/stop indicator
accumulates the effect of a brake indicator and a stop indicator, that is located in a
certain distance behind this brake indicator.
Assume that in the above example the desired stop point C is located in a distance of 50
inches to contact B. If it is desired, that trains decelerate and stop within 50 inches after
entrance into B, then contact B can be specified as a combined brake/stop indicator with
braking ramp 50 inches. If a train, that has to stop in this block, enters the occupancy
C