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In the diagram displayed above the smart mode is shown. On entry into block “Main
Line East” the Dispatcher does not only reserve block “Southtown 2” at the bottom.
The Dispatcher also checks, whether there is a route directly behind “Southtown 2”.
Since this is the case, this route and the block behind of this route are reserved, too.
This is done to avoid unintentional train stops in “Southtown 2” due to the fact, that the
train must not leave “Southtown 2” before the route to “Main Line West” is activated.
If “Southtown 2” and “Main Line West” were connected by a link that does not contain
a route, then only “Southtown 2” would be reserved in this moment.
Smart reservation helps to avoid unintentional train stops caused by long lasting
route activation.
What happens, if “Main Line West” is currently not available in this situation? This is
no problem. The Dispatcher only tries to reserve the additional route and the block behind
of “Southtown 2”. If this is currently not possible, then the train is allowed to proceed
at least to “Southtown 2”, though.
It is also possible to instruct the Dispatcher not to apply the smart mode to a certain
schedule. In this case it is possible to specify a fixed number of blocks, that the Dispatcher
shall try to reserve during execution of the related schedule. If, for example, the
number of blocks to be reserved ahead is set to 2, then the Dispatcher will always try to
maintain the next 2 blocks in front of the train reserved for this train. If it is not possible
to reserve the specified number, then the Dispatcher will allow the train to proceed,
though, if at least one block in front of the train is available.
Using a fixed number of 2 as look ahead for the block reservation ensures that the distant
signal, which is assigned to the block ahead, always shows a correct state. If it is
desired to install a signaling system, that is based on the internally calculated signal aspects
of the Dispatcher, then this option might be useful, especially if distant signals
should be taken into account.
By increasing the look ahead any further for certain schedules it is additionally possible
to give certain trains a higher priority. When a train is able to reserve the complete path
to the destination during start of the schedule, then it is sure, that it cannot be blocked
by concurrent trains during its journey. It has received a high priority to reach its
destination.
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