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Post by Deleted on Oct 30, 2014 10:46:29 GMT
Bit technical this one, Might not be the right place for this, apologies if it isn't.
Reading the signal box special instructions for Wimbledon ASC it says that LUL trains will be described as *I** where the first character is any number from 0-9, I denotes it is an LUL train and then 2 more numbers.
I was wondering if there was a numbering "system" or similar, as the allocation of numbers in the description doesn't quite seem random, but I can't see any pattern for looking!
Any help/info greatly appreciated
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Post by domh245 on Oct 30, 2014 10:57:19 GMT
From casual observation, unless there is disruption, the last 2 numbers of the NR headcode will match the last 2 numbers of the LU reporting number, so for example 2I76 is train 76. I think the first number just cycles through and then repeats the cycle. Today, a quick look reveals there will be 13 trains running under the headcode 2I76 at wimbledon. Using a website such as this: www.opentraintimes.com/maps/signalling/WI_3 is quite useful when you know this info, as you can look in advance what platform you need to dash towards (or if you are arriving into wimbledon, what side of the train to get off from!) When the service is disrupted, the signaller appears to just assign the trains the next headcode that they would have been expecting to go onto NR metals, so if a train is running out of sequence, trains that ended up getting ahead of it would be mis-described. |
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Post by norbitonflyer on Oct 30, 2014 14:09:12 GMT
so for example 2I76 is train 76. I think the first number just cycles through and then repeats the cycle. Today, a quick look reveals there will be 13 trains running under the headcode 2I76 at wimbledon. This looks like the standard BR (NR) reporting number system. In the 1960s and 1970s these were displayed on the front of trains, as seen here. www.solihullmrc.org/head_and_headlampcodes.html#br1962The letter indicates a destination or service group (e.g "A" usually for London, "S" for inter-regional services terminating in Scotland. Most letters are used with different meanings in different parts of the country, so for example "I" is also used for the Cathcart Circle in the Glasgow suburbs. The first digit is the class of train: "0" for light engine, "1" and "2" for express and ordinary passenger trains, "5" for empty stock etc. Thus all District line trains on NR tracks would be class 2 trains and start 2Ixx. The last two digits identify the individual train. If there are more than 100 (or actually fifty, because odd and even numbers are often used for "up" and "down" services) they simply wrap round from 99 to 01) |
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Post by domh245 on Oct 30, 2014 14:24:18 GMT
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Post by Chris M on Oct 30, 2014 15:11:54 GMT
1 - express passenger train, parcel train*, breakdown train or snowplow going to clear the line, traction unit going to assist a failed train.
2 - stopping passenger train
3 - high priority frieght*, parcel train, rail-head treatment train, empty coaching stock train*
4 - Freight train which can run up to 75 mph
5 - Empty coaching stock train
6 - Freight train which can run up to 60 mph
7 - Freight train which can run up to 45 mph
8 - Freight train which can run up to 35 mph
9 - International train, long distance inter-regional train**, other high-importance passenger train**
0 - light engine
* Requires special authorisation. In the case of class 3 ECS trains this is normally to give them sufficient priority in busy areas that they don't arrive late for later class 1 and 2 workings.
** Requires special authorisation, normally used when delay would have significant impacts on other regions or systems.
Class 9 trains have the highest priority, followed by class 1 then class 2, etc. I'm not sure where class 0 fits in this list though.
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Post by norbitonflyer on Oct 30, 2014 16:18:37 GMT
Looking again at what is going today, the bulk of services are either 2IXX or 1IXX Could the 1 and 2 be Edgware Road and City respectively (or vice versa)? , but there are also services running under 3IXX, 4IXX, 6IXX, 7IXX, and 8IXX. No idea: does anything run empty to and from Wimbledon? 3 - high priority frieght*, 9 - International train, long distance inter-regional train**, other high-importance passenger train** Class 9 trains have the highest priority, followed by class 1 then class 2, etc. I'm not sure where class 0 fits in this list though. Originally Class 9 was unfitted freight, and the lowest priority. The neumber has been recycled now that such trains have been abolished. There were some special cases - for example before the days of refrigeration, many fish trains were given class 1 rather than the usual perishable goods and livestock class 3 . The classification predates display of alphanumeric headcodes: previously discs and headlights were used, arranged in an inverted "T" form, giving potentially 15 possibilities although only eleven were used (there were no headcodes with three lights): www.2d53.co.uk/Headcode/headcodeC.htmClass 1 was a disc or light above each buffer, class 2 a single disc or light at higher level, class 5 a centrally positioned disc or light at low level on the buffer beam, etc. The Royal train showed all four lights. |
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Post by Deleted on Oct 30, 2014 22:04:44 GMT
Sorry I should have been clearer in my initial posting.
I'm fully conversant in the "normal" NR TD system, I work with it on a daily basis! It was more in the hope that there was a pattern in how LUL have fiddled it. On TRUST the schedules all show as East Putney - East Putney, with no change of TD at Wimbledon LUL.
The idea of the last two digits matching the last two digits of the train number also seems to make sense - It's just exactly what the first digit means that's a pain.
Also, not sure if a new thread would be better - am I able to get a copy of WTT137 (2009) somewhere?
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