mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Mar 12, 2007 12:01:57 GMT
Reading a WTT from '58, Met. No 2 Section TT 170 .Am slightly puzzled by the train descriptions, anyone care to help with explaining them?
Those that seem straightforward are HZZ (Outer R to H'smith), CZZ (OR C'cle), ZZC (IR C'cle), ZZD (IR H'smith - W'chapel).
So far so good - xZZ is Westbound, ZZx covers Eastbound; this holds true for Goods trains, ZZG being used for Acton - Smithfield paths. Others that seems to make sense for terminals are: ZZA - Aldgates, ZZE - Liv StrEet, ZZB - Barking or Plaistow, East Ham Dt, KZZ Wembley ParK, ZZI Moorgate SidIngs, ZZF Farringdon Sidings.
Inner Rail TD codes are much, much, more puzzling - BBA for Aldgate - Ux, but BBE for Aldgate - W'ford. There are also a whole series of MZx codes for Steam stock. MZB for UxBridge, but MCM and MZM for Baker St - Aylesbury.
Are there answers out there? ;D
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Post by tubeprune on Oct 1, 2007 10:58:53 GMT
Bump Bump I noticed this thread didn't have a reply so I asked a friend who is into this sort of thing and he responded thus:
"The timetables do not contain any lists of codes (until the post 1960 series). A quick check suggests that published codes are of no great antiquity and came into use only after the Second World War, so the ones referred to only had a short life. This will need more research, but an obvious starting point is to look into the train description technology used on the Met, which I think was all relay-based. Therein, I suspect, lies the answer to what appears to be an apparently over-complex coding system. Checking timetables, though, has suggested that it is consistent, which is at least one small benefit."
I have asked him to dig a little more when he has time.
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Oct 1, 2007 13:48:23 GMT
Thank-you. I've got a machine-readable database based on the 1958 WTT codes - and there seems to be apparent internal consistency between them. Since typing that message back in March I've acquired some more Met No1 and No 2 TTs of that vintage. They're waiting in the electric kitchen back in Wales for a moment between trains for analysis. A quick squint shews that there was a method behind the codes, but as yet I've not come up with anything conclusive - I've even tried correlating the present WF0, AM5 et seq.  |
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Dec 8, 2007 17:24:36 GMT
I've been doing a little digging this afternoon...... Sorted through a large pile of recent acquisitions that a freind got for me on - spec. Turns out it's a large selection of District/Picc and Met TTs from the early 50s to the early 60s. The descriptions seem to come in with TTs 170, 172 in June '58. (171 is a Widened Lines TT), and then seem to have gone with 181, 182 in Jan '60. I say 'seem' because there are still gaps in the numbering [1] - City Widened and East London were numbered in the Met. series and I've not got those. The size of the TT book changed from landscape (last known Met. No 2 151/ June '54 - although the TT Notice for Easter '56 is still landscape) to portrait (first known 170, 172). I wonder if the codes came in when the layout of the WTT book was changed and (a bit of a random stab in the dark) the codes are for punching-up the TD code? [1] well, gaps in what I can lay my hands on  |
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Apr 14, 2010 0:28:51 GMT
Well, well. I suppose all things come to those who wait. I've finally found out the answer to this question that I posed all those years ago: These are the codes for the SGE one drum TD transmission. NB Road and Inner Rail - BBA (all stations to Baker Street, FRd, WmP) (= aaa), PrRd, NwPk, Hw, all stns WHw to Ux.
- BBE aaa, PrRd, NwPk, Hw, NHw, all stns to Wf
- BCE aaa, Hw, NHw, all stns to Wf except MPk
- BBF aaa, PrRd, NwPk, Hw, NHw, all stns to Rk
- BCF aaa, Hw, NHw all stns to Rk
- BCM aaa, Hw, MPk, all stns to Ay
- BBJ aaa, PrRd, NwPk, Hw, NHw, all stns Rk - Wf
- MCA (all stns to BkS, FRd) (= ddd), Hw, all stns WHw to Ux
- MCE ddd, Hw, NHw, all stns to Wf
- MCM ddd, Hw, MPk, all stns to Ay
- MZM ddd, FRd, MPk, all stns to Ay
- MZN ddd, FRd, MPk, all stns to Chm
- MZB ddd [RL] [1], all stns to Ux
- MZE ddd, NHw, all stns to Wf
- MCL ddd, Hw, MPk, Rk
- LZZ ddd, then local to N
- JZZ all stations to Baker Street
- CZZ Circle Putney line, South Kensington (via High St.)
- HZZ all stns to Hm
- AZZ Goods and Special
- EZZ Empty
- ZZZ Local code for shunting moves
[1] [RL] was Eastcote until 31.1.57 Looking at the time, I shall have a snooze: I'll do the Outer Rail and Southbound later on (plus a key for the abbreviationistas). |
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Apr 14, 2010 11:35:20 GMT
SB Road and Inner Rail- CCZ Hw, NwPk, PrRd, FRd, BkS (= xxx)
- CCH as above, all stations to Aldersgate
- CCA xxx, all stations to Aldgate
- CCI xxx, all stations to Moorgate
- CCE xxx, all stations to Liverpool Street
- CAZ xxx, all stations to Baker Street (local road)
- CZZ xxx (Hw, NwPk, PrRd, WmP)
- DZZ Hw, WmP
- DCA Hw, WmP, FRd, BkS, all stations to Aldgate
- DCI Hw, WmP, FRd, BkS, all stations to Moorgate
- DCZ WmP, FRd, BkS
- ZCZ FRd, BkS
- ZCE FRd, BkS, all stations to Liverpool Street
- ZCA FRd, BkS, all stations to Aldgate
- ZAZ N, DHill, WGrn, Kil,WHm, FRd, BkS
- ZBZ WmP and all stations to Elephant (Bakerloo)
- ZZB Barking Line [2]
- ZZC Circle Line [2]
- ZZD Whitechapel [2]
- AZZ Goods and Special
- EZZ Empty
- ZZZ Local Code for Shunting Moves etc.
[2] ZZB, ZZC, ZZD added 2.7.56 AbbreviationsBkS = Baker St, FRd = Finchley Road, WmP = Wembley Park, PrRd = Preston Rd, NwPk = Northwick Park, Hw = Harrow, WHw = West Harrow, NHw = North Harrow, MPk = Moor Park, Ux = Uxbridge, Wf = Watford, Rk = Rickmansworth, N = Neasden, DHill = Dollis Hill, Kil = Kilburn, WHm = West Hampstead, Hm = Hammersmith. RL = Rayners Lane, Chm = Chesham, Ay = Aylesbury There are a few stopping patterns that are no longer used, and moreover there are still a couple of points of conflict that are different from the published WTTs: most particularly ZZG which was used for Goods - I have also seen ZZA in use on the Inner Rail - perhaps time for a bit more digging around - however, it proves that if you are prepared to wait, most of the answers will eventually arrive!
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