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| Block Signalling 08/01/2011 at 11:02 #2214 | |
derbybest
274 posts |
Found this on You Tube today it may be helpful to some of you http://www.youtube.com/watch?v=eT_AVJjnotc&feature=sub
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| Block Signalling 08/01/2011 at 11:02 #13134 | |
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derbybest
274 posts |
Found this on You Tube today it may be helpful to some of you http://www.youtube.com/watch?v=eT_AVJjnotc&feature=sub
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| Block Signalling 08/01/2011 at 13:43 #13136 | |
jc92
3687 posts 
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nice one DB nice and simple explanation
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| Block Signalling 14/01/2011 at 23:28 #13193 | |
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daverail01
32 posts |
If you want to find out a bit more about AB signalling go to the National Railway Museum on Saturday 22nd as there will be a demonstration of the ex L&Y signalling school layout,
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| Block Signalling 19/01/2011 at 15:24 #13234 | |
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pilotman
189 posts |
Simple enough, but someone new to this might be wondering why it needs 3 running signals in each direction to control trains on plain line.
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| Block Signalling 20/01/2011 at 12:55 #13252 | |
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TomOF
452 posts |
pilotman said:Simple enough, but someone new to this might be wondering why it needs 3 running signals in each direction to control trains on plain line. A very simplified explaination of a simple 3 signal section would normally be thus 1 distant 1 home 1 starter the home signal will protect a place such as a station or level crossing. the starter signal is released by the next signal box to allow trains into the next block section. This can't be cleared until the next block section is clear until at least it's home signal. the distant signal notifies an approaching train that both the home and starter are clear and that the train can proceed non stop through the section. Log in to reply |
| Block Signalling 20/01/2011 at 13:02 #13253 | |
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Late Turn
699 posts
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But - to the newcomer - why can't the function of the section signal be carried out by the home signal? Plenty of 'basic' locations have no more than a distant and a solitary home in each direction. Obviously - not to a newcomer - the provision of a separate signal in advance of any connections allows you to shunt clear of those connections without going forward into the block section, and such signals might be retained after crossovers/sidings were removed. Log in to reply |
| Block Signalling 20/01/2011 at 19:38 #13258 | |
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Zoe
252 posts |
Also, where the home signal is also the section signal there are of course no station limits so you wouldn't be able to knock out to the box in rear if the box in advance hasn't accepted the train as the train needs to pass clearing point distance beyond the home signal.
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| Block Signalling 21/01/2011 at 08:00 #13272 | |
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Late Turn
699 posts
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Quite often though, a train standing at the section signal would still be within the clearing point anyway.
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