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• if a train is stopped or changes its direction after passing the reference indicator and
before arriving at the assumed location of the virtual contact, then the virtual contact
is not turned on, even if the train continues traveling in the original direction and
passed this location.
• it is very important, that the scale speed of the passing engines and trains can be calculated
correctly. For this reason it is recommended to adjust the speed profile of
each affected engine accordingly (see section 3.5, “The Speed Profile”).
• it is very important, that the direction of travel of each passing engine or train is
known. Otherwise virtual contacts could be turned on by trains traveling in the
wrong direction. For this reason it is also essential to determine, which engine or
train passes the reference indicators assigned to the virtual contact. This is only possible,
if the affected trains are running under control of the Dispatcher, and if the
reference indicators are assigned to blocks.
Virtual contacts can only be turned on by engine and trains running under control
of the Visual Dispatcher. The reference indicator must be assigned to a block.
In conjunction with Virtual Contacts the difference between momentary contacts and
occupancy sensors has to be taken into account. If an indicator representing a momentary
contact is used as a reference indicator of a Virtual Contact then the one and only
sensing point represented by the momentary contact is used as the base of the distance
from the reference indicator to the Virtual Contact.
If an indicator representing an occupancy sensor is used as a reference indicator of a
Virtual Contact then the sensing point reached first by trains running into the particular
direction is used as the base of the distance from the reference indicator to the Virtual
Contact. In Diagram 72, for instance, the left boundary of the sensed track section is
used as the base of the distance for trains running from the left to the right.
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Using Virtual Contacts as Indicators in a Block
Virtual contacts can also be used to reduce the necessary number of track sensors used
as indicators in the Dispatcher, for example as brake and stop indicators. Nevertheless if
it is desired, that trains stop very exactly - e.g. in front of a red signal, then it is recommended
to use a real sensor and a contact indicator as stop indicator to stop the train.
But it is actually possible to use a virtual contact to report block entry or as a brake indicator.
The reference contact of the virtual contact could be the stop indicator of the
previous block, in which case the entry into the related block is indicated a certain time
after a train passed the stop indicator of the previous block. Since the brake indicator