Re: Signalling in Melbourne
David Bromage (dbromage@metz.une.edu.au)
20 Nov 1997 03:06:14 GMT
Chris Gordon (cmgord@ecr.mu.oz.au.#) wrote:
>The signalls are all two colour ie. Red or Green. Most have a trigangle
>with an A in it under them. This means that it is an automatic signall,
>these are green (ie no trains in area). Those with an 'A' are red (ie
>no trains in area) they protect Points and used to protect the swinging
>gates but these are auto booms now. I think that the green means "Clear
>for one section" red "Stop". At the exit and entry to the line it is
>normal 3 position auto signalls showing only medium speed not full.
>(expect the signall at the end of newmarket station which shows full
>speed for trains going to Essendon.
This line is quite interesting. It is the only place with two aspect
automatic signals. In year gone by, all the signals on the line could be
reversed so goods trains could work under siding conditions.
>In Melbourne signalls that are auto have the lights offset Home signalls
>have the lights in a vertical line. All the signalls in the city loop
>are in a vertical line. Does this mean that they are all home signalls
>and can't be passed at "Stop"? If so how does the signall man give
>permission to pass them at stop if there is no way of showing "red over
>red over yellow"?
In the case of a defective signal, the signalman can authorise a train to
pass a signal at stop.
Cheers
David