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Post by paterson00 on Aug 23, 2009 12:54:13 GMT
It was explained to me briefly and I got it a little but would love a better explination.
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Post by Harsig on Aug 23, 2009 17:42:38 GMT
Some of this was covered here |
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Post by railtechnician on Aug 23, 2009 20:46:24 GMT
It was explained to me briefly and I got it a little but would love a better explination. 'Slotting' as a term comes from way back in the earliest days of signal interlocking being derived from the physical slot cut in a signal post through which a bar was slid to either inhibit or enable the mechanism that pulled the wire which operated the signal arm. In simple terms a 'slotted' operation requires permission in the form of an action usually taken in another place. As pointed to by Harsig the typical use is where two IMRs may control signals in a route. I can think of several, including the North and South IMRs at Golders Green, the East (94 slot) and West IMRs at Acton Town, the Northern and Piccadilly IMRs at Euston and King's Cross (15 slot) for moving trains in the loop between the two lines, and at Ealing Broadway IMR where slotting was used to route trains between the District and Central although it has long been defunct. Slotting has its origins in mechanical signalling and that is perhaps the best way to consider it even though these days it is most likely to be electrical. |
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towerman
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Post by towerman on Sept 3, 2009 21:46:50 GMT
At SMD we have to give "slots" to allow trains to enter the depot.
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Deleted
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Post by Deleted on Sept 4, 2009 11:45:20 GMT
you can still route a train at ealing to the central and vice versa but it is a complicated process which we have lerned after taking it back from tubbylines involving both earls court and wood lane control rooms.
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Post by railtechnician on Sept 4, 2009 14:05:25 GMT
you can still route a train at ealing to the central and vice versa but it is a complicated process which we have lerned after taking it back from tubbylines involving both earls court and wood lane control rooms. Oh do tell. We always thought the problem lay with the Central line as the kit in Ealing Broadway cabin relay room did what it was supposed to. Either the Central line signalling was faulty for some reason or the Wood Lane signalman didn't know what to do was what we always thought was the issue but there was no useful liaison at the time because the central didn't want to know. |
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Oracle
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Post by Oracle on Sept 4, 2009 14:59:18 GMT
Is the link still padlocked? I have only ever been over it once in service.
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Deleted
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Post by Deleted on Sept 4, 2009 15:25:48 GMT
i cannot remember which way round it is but in one of the control rooms there is a special button pressed which basically somewhere in the lever op (god knows what its called on the central line stuff) gives it permission. The very first time we done the site we had assistance from a BCV T/O who took control of the local panel and done it that way
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Post by railtechnician on Sept 5, 2009 2:38:09 GMT
i cannot remember which way round it is but in one of the control rooms there is a special button pressed which basically somewhere in the lever op (god knows what its called on the central line stuff) gives it permission. The very first time we done the site we had assistance from a BCV T/O who took control of the local panel and done it that way Yes well it helps when a line TO is available, when we were supervising stock moves at Ealing Broadway there was supposed to be a Central line TO present as well but we never saw him and Wood Lane thought it needed a slot from Earls Court in order to accept a train IIRC. Generally one of our SOMs would do the business in the Ealing Broadway SER (I have no idea what exactly as I never so much as peeked in the door of that room) so that we could set the route up from the District lever frame. |
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mrfs42
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Post by mrfs42 on Sept 5, 2009 9:25:24 GMT
That particular bit of slotting at Ealing Broadway is now on borrowed time; 45, 47, 50, 51, 52, 53 slots at Golders should be alright for a while.
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Post by railtechnician on Sept 5, 2009 13:08:13 GMT
That particular bit of slotting at Ealing Broadway is now on borrowed time; 45, 47, 50, 51, 52, 53 slots at Golders should be alright for a while. Gosh, I haven't been in the Golders IMRs since the Northern Line resignalling changeover between there and Chalk Farm circa 1978. I worked both the track dropping boards on that changeover, the commissioning engineer was head of New Works at the time, Eric Eden. It doesn't seem that long ago! |
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Deleted
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Post by Deleted on Sept 5, 2009 16:44:06 GMT
thats no relation to Martin Eden is it?
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Post by paterson00 on Nov 26, 2009 4:42:31 GMT
Some of this was covered hereWhere? |
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Post by Colin on Nov 26, 2009 6:40:13 GMT
The word "here" is a clickable link - so click your left mouse button on that word and you'll be taken to the link  |
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Post by railtechnician on Nov 26, 2009 8:08:08 GMT
thats no relation to Martin Eden is it? I really don't know but it is possible. LT/LU always was a family firm, I don't thi nk it is in the same way these days. I knew quite a few fathers and sons, brothers etc but not always in the same department though there were several sons of supervisors and higher on the firm. I'm not sure it would be proper to drop a bunch of names here. When I was in the training division I had Les Lawrence's (head of signalling at the time which I think then was known as DSEE) son as an assistant and driver for a while. As a chargehand and supervisor I had several supervisors sons working with me when they were apprentices. Railway engineering it seems is quite a small world in so many ways. |
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