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LNWR Block Instruments

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

Re: LNWR Block Instruments

Unread postby John Hinson » Mon Mar 13, 2017 6:42 am

Gary the Guard wrote:So on the two tapper blocks did the opposite boxes share the same underslung bell or was an additional one provided?

Two bells.

John
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Re: LNWR Block Instruments

Unread postby RDNA » Mon Mar 13, 2017 10:19 am

The photos in my flickr album here - https://www.flickr.com/photos/90214143@ ... 6581701199 may be of interest.

It should be noted that the "double tapper" instruments communicated with separate single face instruments in the adjoining double manned boxes, this allowed the "Down Man" and "Up Man" to signal their respective trains, but there was an understanding that they should not both try to bell you at the same time!

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Re: LNWR Block Instruments

Unread postby beast66606 » Mon Mar 13, 2017 8:33 pm

Chris L wrote:Mike,

I think the L&Y faces were fitted to LNWR blocks when they were installed (as replacements by the LMS?) in ex-L&Y boxes.

I have seen photos of several such instruments with L&Y faces (mostly permissive) in L&Y boxes around the Bury area (on the east -west line, not the north-south!) and around Blackburn Station.

Chris.


I own a Lanky Fletchers and was told it was from the Blackburn area.
Better to be thought a fool than to type a response that confirms it.

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Re: LNWR Block Instruments

Unread postby Ashley Hill » Mon Mar 13, 2017 9:54 pm

Nice photos of the Chester instruments. Dog kennel bells are provided here so the need for an additional tapper on the instrument seems unnecessary.
With the Talacre example what provisions were made instrument wise when the Nant Hill section was four track. After all this box only ever signalled down trains.
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Re: LNWR Block Instruments

Unread postby John Hinson » Tue Mar 14, 2017 3:03 am

Gary the Guard wrote:Nice photos of the Chester instruments. Dog kennel bells are provided here so the need for an additional tapper on the instrument seems unnecessary.

If that bell is pertinant to the instrument I would say it is a bodge. They were built with two bells in the instrument.

Gary the Guard wrote: With the Talacre example what provisions were made instrument wise when the Nant Hill section was four track. After all this box only ever signalled down trains.

There is no reason why both bells could not be switched through as the adjacent boxes had corresponding two-bell instruments, but I believe local instructions defined that one bell only should be used. This would be more relevant if an adjacent box also switched out as the next boxes would have conventional instruments with one bell.

It goes without saying that there must have also been an instruction prohibiting Nant Hall from opening if the adjacent boxes were not!

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Re: LNWR Block Instruments

Unread postby RDNA » Tue Mar 14, 2017 10:40 am

We discussed Talacre - Nant Hall - Prestatyn in 2014-

With thanks to John Hinson the drawings that Alan refers to are here -

Gents,

For some reason I couldnt reply via the Signalling Forum so I'm trying
it this way.

Please find enclosed sketches of block shelves for Talacre and
Prestatyn. It does show additional functions with Nant Hall switched
in.

Regards,
Alan Roberts

http://signalbox.org/forum_files/prestatyn.jpg
http://signalbox.org/forum_files/talacre.jpg

I think that they show separate bells to Nant Hall, more observations may follow.

DB


Although the drawings are not very clear I think the Talacre one implies separate 'Coffin Bells' ?

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Re: LNWR Block Instruments

Unread postby RDNA » Tue Mar 14, 2017 10:48 am

Postby Gary the Guard » Mon Mar 13, 2017 9:54 pm

Nice photos of the Chester instruments. Dog kennel bells are provided here so the need for an additional tapper on the instrument seems unnecessary.


Gary, The 'Dog Kennel / Coffin Bell' near to the main line double tapper instrument to/from Chester No.4 had been to Chester No.3A for a bolt locked connection to an engine siding.

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Re: LNWR Block Instruments

Unread postby Ashley Hill » Tue Mar 14, 2017 7:19 pm

Yes i now realise that. It's just i didn't know that some Fletcher instruments could be fitted with two bells.
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Re: LNWR Block Instruments

Unread postby RDNA » Wed Mar 15, 2017 9:35 am

Post by Gary the Guard » Tue Mar 14, 2017 7:19 pm

Yes i now realise that. It's just i didn't know that some Fletcher instruments could be fitted with two bells.


I think it surprised me when I first encountered them in 1971.

The second bell was completely concealed inside the first, the only outward sign was a second striking hammer - i.e. one each side of the bell, I think there must have been a hole in the outer bell to allow the inner one to be struck.

I remember flicking the hammers to check which one had rung!

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Re: LNWR Block Instruments

Unread postby John Hinson » Wed Mar 15, 2017 10:26 am

I think you will find the inner bell hangs lower than the outer. Make a hole in a bell and it becomes an ex-bell.

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Re: LNWR Block Instruments

Unread postby Ashley Hill » Wed Mar 15, 2017 1:19 pm

Well that's cleared that up. Thanks for your help chaps.
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