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section B from the left, it will be decelerated to threshold speed within 50 inches from
the left border of B. When it arrives at the point C, which is 50 inches away from the
entrance to B, the train will be automatically stopped.
In other words: the combined brake/stop indicator B with ramp 50 inches works exactly
like a combination of a brake indicator with a braking ramp of 50 inches plus a stop
contact located 50 inches behind this brake indicator.
Combined brake/stop indicators allow operation of a complete block with one single
indicator symbol.
5.9 Block Signals
General
Traffic Blocking is used on real railroads to prevent two trains from running into each
other by dividing the track into sections protected by signals. These signals (here called
block signals) indicate to an oncoming train whether it can enter the block which begins
beyond the signal. If the block ahead is occupied the driver of a train approaching the
signal protecting that block sees a red stop light. If the section in front is unoccupied
and the train has permission to enter it the driver sees a green signal light. In addition to
the signal for the next block the driver is usually also presented with an advance signal
which indicates the status of the block beyond that which is being entered. The advance
signal indicates green, meaning that the following block is free to be entered; otherwise
the block ahead is occupied and the train should proceed into the next block with caution
and be prepared to stop at a red light.
When a train is running under control of the Dispatcher, TrainController automatically
calculates signal aspects taking into account the availability of blocks and routes
in front of the train. These signal aspects are displayed in the block diagrams and as
home and advance signal in the Train Window (see chapter 3, “Train ”). The signals indicate,
whether the corresponding block may be left and how the following block must
be entered. The brake and stop indicators assigned to a block take care that a train is
stopped accordingly at the appropriate location. Since TrainController assumes that
the brake and stop indicators belonging to a block are located near the exit of the block,
this is also assumed for the imaginary location of block signals.
TrainController already displays the signal aspect currently valid for a certain
block, when the first indicator assigned to this block is reached. It is possible to say:
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