North Melbourne Locomotive Depot Signalling Diagram
Signalling upgrading North Melbourne-Upfield for express services. Across the ARTC interstate corridor in order to access the Seymour Loco depot area. Explanatory notes. This would replace the existing manual Train Orders safeworking.
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This is a brief (but hopefully still accurate!) overview of signallingas used in NSW. I am not safeworking expert, so if there are errorsplease let me know.
Double Colour Lights
Double light signals are used mainly in the area where suburban andinter-urban passenger trains are used. The top light indicateswhether a train can proceed or not, whereas the second light indicatesthe state of the next signal down the line. Giving the driver anindication of the following signal allows closer and more efficientrunning of trains in the busy CityRail network.
Often only a subset of these signals are used. In much of Sydneyyou will only see STOP, CAUTION and CLEAR aspects.
These signals are divided into two types: controlled (also knownas absolute) andautomatic (a.k.a. permissive).Controlled signals are operated by signal boxes and allow for protection ofjunctions and such. Automatic signals are not directly controlled;their purpose is to maintain the separation of trains.
Automatic Signals
Automatic signals can be distinguished from controlled signals in that thelights are vertically offset from each other.
| Indication | Meaning | Indication | Meaning |
| STOP | Stop. | MEDIUM | Proceed; the next signal displays at least a CAUTION or CAUTION TURNOUT indication. |
| LOW SPEED | Proceed ready to stop at the next signal. Where train stops are provided, a maximum speed of 25km/h applies (only applicable at signals with a low-speed indicator). | PRELIMINARY MEDIUM | Proceed. The next signal displays at least a MEDIUM indication. |
| CAUTION | Proceed; the next signal may be at stop. | CLEAR | Proceed. |
Controlled Signals
Plextor px-820a driver for mac. Controlled signals are controlled from a signal box. They are typically usedbefore facing junctions and other areas which need protection.
| Indication | Meaning | Indication | Meaning |
| STOP | Stop. | MEDIUM TURNOUT | Proceed through the turnout. The next signal displays at least a CAUTION or CAUTION TURNOUT indication. |
| LOW SPEED | Proceed ready to stop at the next signal. Where train stops are provided, a maximum speed of 25km/h applies (only applicable at signals with a low-speed indicator). | MEDIUM | Proceed; the next signal displays at least a CAUTION or CAUTION TURNOUT indication. |
| CAUTION TURNOUT | Proceed at medium speed through the turnout; the next signal may be at stop. | PRELIMINARY MEDIUM | Proceed. The next signal displays at least a MEDIUM indication. |
| CAUTION | Proceed; the next signal may be at stop. | CLEAR | Proceed. |
Single Colour Lights
Single colour lights come in several varieties, but the following usageis typical.
| Indication | Meaning | Indication | Meaning |
| STOP | Stop. | MEDIUM | Proceed; the next signal displays at least a CAUTION or CAUTION TURNOUT indication. |
| CAUTION | Proceed; the next signal may be at stop. | CLEAR | Proceed. |
Semaphore Signals
Lower Quadrant Signals
| Home | Indication | Meaning | Home | Indication | Meaning |
| STOP | Stop. | CAUTION | Proceed; the next signal will be at stop. | ||
| CLEAR | Proceed. | CLEAR | Proceed. |
Upper Quadrant Signals
(to be added)Signalling Terminology
A signal which protects an interlocking area, for example a junction,crossing or yard.
A signal which protect the region outside a home signal.
A caution signal which warns of a following home signal.
Effectively a distant signal fixed at caution.
The signal which controls the entry of a train into the next section.
Other Signals and Related Equipment
This is a small black box usually mounted under the awning at a station,with the words 'GUARDS INDICATOR' written above a white light. This light is illuminated when it is safe for the train to leave the station.It is provided for the train guard, so that he/she does not blow thewhistle for the train to leave when it is not safe to do so.
Throughout the Sydney metropolitan network, you will notice a silverbox with an arm attached to the side which can be raised or lowered.These are situated on the left hand side of the track, usually nextto a signal. These are known as train stops. When a signal prevents atrain from proceeding, the arm is raised. If a passenger train attemptsto pass the location, the arm hits the trip valve on the front, which forcesthe brakes to come one.
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You might also notice these spread out along the platform at City Circlestations. These are used in conjunction with low-speed signalling to allowtrains to run closer than normal, while still preventing a collision.
A yellow triangular which serves as a fixed distant signal. It is usedto indicate that a train should approach with caution. These are oftenseen on country branch lines at the approaches to significant locations.