We have two driving conditions
1) GB: Big movements (Dutch: grote beweging)
2) KB: Small movements (Dutch: kleine beweging)
3) RB: shunting movements (Dutch: rangeer beweging)
KB can only be given by a main signal, never by a permissive signal. The trainengineer must be able to stop at any danger: wrong spring, another train on the same track, order given by signal instructor.
Type1 Type2 Red. Absolute stop Red and white. Proceed in KB
Picture 37.0 Shunting signal in station Leuven
Independent placed shunting signals:
two white lights horizontal: Stop for KB two white lights right up: Proceed for KB
Picture 37.1 Shunting signal in station Bilzen
We will give an example.
This is the default lay-out
A locomotive approaches and needs to couple with his cars in the siding. The locomotive will get a shunting signal for the approach on a occupied track
Picture 37.2: Shunting signal in Montzen © Lucas Böckmann
The train will drive under big movement and will continue after the main signal as small movement
An other example, now the train can continue under big movement because the track isn't ocupied
In GB the independent placed shunting signals stay closed.
A sign will replace an always closed independent placed shunting signal.
Picture 37.3: Shunting sign at Ford Genk
The sign is placed at the end of the stations. Train in KB may not trespass the sign. This prevent train leaving the station in KB.
Shunting signals with lighten letter
To keep the shunting movement as short as possible shunting signals can be provided with letters. The letter indicate the signal for the return.
Independent placed shunting signals are mostly used at the end of stations.
This can be best explained with an example.
Red line is KB
A train coming from the left need to be signalled to track 3, but can only access it from the right-hand side.
The distance between in the station is too short, while the engineer is informed by a green-yellow vertical signal.
The train engineer will now proceed till the shunting signal and wait until the undependant placed shunting signal opens.
When this extra shunting signal wasn't availible, the train should have to move in the track out of the station area. As you can find back in the next example
In the Brussel stations the platforms can have two exit signals. To reduce the distance the switches are place already in the platform area.
Most customers that use the services of B-rail have their own small private shunting yard. Mostly the spring are manually served. Some customers even don't have there own engine to shunt. So they use the full service of B-rail. The access to those yards is always given with a shunting signal. For security reasons the privat line will be extra isolated that no wagon can access improper the b-rail tracks. When entering, the trainengineer must respect the independent placed shunting signals.
The switches return in the straight state after 10 minutes.
When the train A is moved inproper in the direction of the junction, it will never have access to the main line.
Normally they isolated the main line with a spring. If the extra switch is unavailible, B-rail use a block device.