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Great Chesterford mechanical searchlight

British signalling of the past (UK, excepting Northern Ireland)

Great Chesterford mechanical searchlight

Unread postby Richard Pike » Sun May 19, 2013 9:19 am

What was this signal called? Was it worked by a lever or was it controlled by the intermediate block home automatically?



http://www.flickr.com/photos/billatkins ... 97024@N08/



http://www.flickr.com/photos/52087249@N ... 97024@N08/
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Re: Great Chesterford mechanical searchlight

Unread postby Fast Line Floyd » Mon May 20, 2013 12:30 pm

It would be an intermediate block distant signal and as it is motor worked it would almost certainly be worked automatically by the clearance of the intermediate block home signal.

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Re: Great Chesterford mechanical searchlight

Unread postby Andrea » Mon May 20, 2013 5:06 pm

Isn't there something similar at Quorn on the GC?
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Re: Great Chesterford mechanical searchlight

Unread postby MDickinson » Mon May 20, 2013 5:13 pm

Andrea wrote:Isn't there something similar at Quorn on the GC?


..and Richards back garden! :)
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Re: Great Chesterford mechanical searchlight

Unread postby Richard Pike » Mon May 20, 2013 6:48 pm

MDickinson wrote:
Andrea wrote:Isn't there something similar at Quorn on the GC?


..and Richards back garden! :)


Mine pre dates the Quorn mechanical searchlight by a few weeks though they were both made by the same lady.

The reason i ask is i have seen another Adlake lamp with wire labels still attached. It has additional features that suggest it was from a location where there was a risk of it being backlit by the sun. Littlebury is my prime suspect.
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Re: Great Chesterford mechanical searchlight

Unread postby Richard Pike » Wed Jun 28, 2017 7:56 pm

I have good reason to believe the spectacle plate on Great Chesterford up main intermediate block auto distant was only proved 'on'.. Does anyone know how it was repeated in the box? Dial or lamp type indicator?
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Re: Great Chesterford mechanical searchlight

Unread postby Fast Line Floyd » Wed Jun 28, 2017 9:00 pm

Possibly through the IB home proving circuit and indicator, I've seen that done elsewhere.
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Re: Great Chesterford mechanical searchlight

Unread postby Richard Pike » Thu Jun 29, 2017 6:09 am

Since posting last night i have acquired a track plan. This has helped when looking at John's photo's on the main site but still doesn't answer the question fully. For a start there appears to be two indicators above lever 21. The up main intermediate block home was lever 29. There appears to be a semaphore repeater for that then another on top the shelf.
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Re: Great Chesterford mechanical searchlight

Unread postby John Hinson » Thu Jun 29, 2017 8:17 am

This is the best I can give you from that picture - that is full resolution and it is grainy but if I remove the grain you lose detail.

https://signalbox.org/forum_files/gtchesterford-f.jpg

To my eyes the indicator above 21 signal repeater also reads 21 and is a locked/free indicator. The one above and slightly to the right of 29 looks to be similar, ecept the needle is in the other position at the time of the picture.

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Re: Great Chesterford mechanical searchlight

Unread postby Richard Pike » Fri Jun 30, 2017 6:58 pm

I agree about 21 Locked/free indicator. Having another above 29 also makes sense, both reading to the end of the overlap of the section ahead but selected by 20 points. 21 appears to also have a train waiting unit. My plan shows the goods road as non track circuited.

It seems odd that the up IB distant had a fog hut. I thought it may just be for the up goods but it is between the main and goods. I have now seen a picture of the summit looking in the down direction. There appears to be far too many rods about for this location. I suspect a Clayton Fogging Machine or similar and one fogman doing both up IB homes and down auto section. I thought the idea was to do away with fogmen once intensified lights were used? The fog hut looks to post date the mechanical searchlight.

The up pegger appears to have a label stuck over the indicator. Was this the case?

Many thanks for the enlarged picture.
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Re: Great Chesterford mechanical searchlight

Unread postby John Hinson » Sat Jul 1, 2017 2:51 am

Richard Pike wrote:The up pegger appears to have a label stuck over the indicator. Was this the case?

Yes, there is. Without looking up this specific location I think I am correct in sayng (strictly from memory from the 1970s!) that the Up Line was TCB for several sections of the line, but would change to Absolute Block if a box was switched out. I suspect that is what the label relates to.

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Re: Great Chesterford mechanical searchlight

Unread postby Richard Pike » Sun Jul 9, 2017 8:34 am

The plan i refer to earlier has now been uploaded..

https://www.flickr.com/photos/pwayowen/ ... 6/sizes/o/
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