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quicky
May 5, 2006 22:37:10 GMT
Post by Deleted on May 5, 2006 22:37:10 GMT
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quicky
May 5, 2006 22:39:48 GMT
Post by agoodcuppa on May 5, 2006 22:39:48 GMT
Is it possibly a trainstop going down a bit slowly?
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quicky
May 5, 2006 22:40:06 GMT
Post by Deleted on May 5, 2006 22:40:06 GMT
Is it the programme machine moving. I know it is something like that (probably).
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quicky
May 5, 2006 22:40:59 GMT
Post by Deleted on May 5, 2006 22:40:59 GMT
yep not bad a good cuppa about 2 mins
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quicky
May 5, 2006 22:41:35 GMT
Post by Tubeboy on May 5, 2006 22:41:35 GMT
A bobbing signal, as for the reason, not certain i am only a humble sa. problem with trainstop [cant lower] or an electrical fault.  |
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quicky
May 5, 2006 22:43:21 GMT
Post by Deleted on May 5, 2006 22:43:21 GMT
I've seen loads of LU signals doing that, esp. ones with arbor lights.
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quicky
May 5, 2006 22:43:39 GMT
Post by Deleted on May 5, 2006 22:43:39 GMT
a bobbing signal would look like christopher j's avatar pic
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quicky
May 5, 2006 22:45:20 GMT
Post by Deleted on May 5, 2006 22:45:20 GMT
junction signals only clear when 3 filaments are alight so before the trainstop goes down u usually see the red and the arbour lights come on first then it goes down and clears
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quicky
May 5, 2006 22:47:33 GMT
Post by Deleted on May 5, 2006 22:47:33 GMT
looks like a dual aspect to me, number of reasons for this, the most common one being ,,, trainstop failed in the up position
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quicky
May 5, 2006 22:48:29 GMT
Post by Deleted on May 5, 2006 22:48:29 GMT
Yeah - something I've always wanted to clear up.... take this as an example:
Say if a signal was at danger, then it clears. Why does it go Red to Red / Green to Green?
Is it because an aspect has to be displayed at all times?
Or is it to with trainstops as described in above posts?
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quicky
May 5, 2006 22:49:06 GMT
Post by Deleted on May 5, 2006 22:49:06 GMT
u also get it if the trainstop is slugged(early type of speed control) i.e EC600 or the ones half way down whitechapel platforms
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quicky
May 5, 2006 22:50:08 GMT
Post by Christopher J on May 5, 2006 22:50:08 GMT
a bobbing signal would look like christopher j's avatar pic <--- Just for anyone who is curious at what a bobbing signal looks/behaves like... |
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quicky
May 5, 2006 22:52:08 GMT
Post by Deleted on May 5, 2006 22:52:08 GMT
there is one feed for the green light which comes from the signal relay and the red light is fed from the signal relay and the trainstop so if you had a dual aspect when the signal was failing it means the trainstop is up and failing as its making the contact to keep the red light alight but you would get a green because the signal relay is operating correctly
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