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Occupied Block
A block is assumed to be occupied, if at least one of the indicators assigned to the block
is turned on.
Reserved Block
Each block can be manually or automatically reserved for an engine or train by the
Dispatcher. Reservation serves to support the following goals:
• Since a block can be reserved only for at most one engine or train, train collisions
are avoided if blocks are arranged and reserved correctly.
• The program is able to determine, in which block a certain engine or train is located.
This enables operations tied to the locality of trains - for example stopping a train in
front of a red signal.
• The use of traffic boxes allows indication of train positions in the switchboard.
• Train detection and train tracking is based on dynamic and automatic reservation of
blocks, too (see 5.5, “Train Detection and Train Tracking”).
For shunting or similar manual operation it is possible to reserve a group of related
blocks manually. In this case the Dispatcher takes care, that automatically controlled
trains do not enter these blocks. If reserved blocks are no longer needed, they can be released
by yourself or automatically by the Dispatcher.
Current Block
Among the blocks, which are reserved for a train, there is a special block, where the
head of the train is assumed to be located. This block is called the current block of the
train. Through the current block all block related operations which affect the speed of a
train (like running with restricted speed) are performed.
In the beginning you must manually assign each engine or train to its current block. Afterwards
this assignment is adjusted automatically by TrainController according to
the position changes of the affected trains. Even after terminating and restarting of the
program this assignment is automatically updated. Only if an engine or train is moved
by hand to another track you must assign the engine or train to its new current block
again.