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| Old school DMU workings in WTTs 04/02/2012 at 23:42 #28837 | |
officer dibble
390 posts |
Evening all, I have a number of BR era projects currently in the pipe-line, and am curious with the D1/D2/D3 timing loads used for local unit workings through the 80s & early 90s before the introduction of the "Sprinter" type units (classes 150/153/155/156/158). Does the number after the D denote how many units on the service or the maximum number of carriages the unit will convey? Thanks in advance Confused of Reading! 
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| Re: Old school DMU workings in WTTs 04/02/2012 at 23:50 #28838 | |
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Sacro
1171 posts |
http://www.SimSig.co.uk/dokuwiki/doku.php?id=usertrack:ttuse:munits&s[]=dmu
Log in to reply The following users said thank you: officer dibble, sunocske |
| Re: Old school DMU workings in WTTs 04/02/2012 at 23:50 #28839 | |
jc92
3631 posts 
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ive noted some D1/2 etc formations actually appear to denote the number of units in later WTTs (i have one for the MML for 91 which indicates D2 as being a pair of 156s) it seems the best way to decode this is to have the relevant sectional appendix for older WTTs (most of them indicate that the sectional appendix lists the formations) i beleive it is intended to indicate the POWER units... so a unit with 1 powered and 1 trailer, coupled to a pair of power twins would be D3 -cant be sure of this. "We don't stop camborne wednesdays" Last edited: 04/02/2012 at 23:54 by jc92 Log in to reply The following user said thank you: officer dibble |
| Re: Old school DMU workings in WTTs 04/02/2012 at 23:52 #28840 | |
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Noisynoel
989 posts |
Just for you Dibs... http://www.SimSig.co.uk/dokuwiki/doku.php?id=usertrack:ttuse:munits&s[]=multiple&s[]=unit Noisynoel Log in to reply The following users said thank you: officer dibble, Horgy |
| Re: Old school DMU workings in WTTs 12/02/2012 at 10:50 #29317 | |
Simdmuk
153 posts |
Just to add to this.. Jc92 is broadly speaking correct.The timing load is based on the power to weight ratio of the units,however it doesn't always correspond to the number of powered vehicles. Roughly, the more powerful the unit the higher the number. So typically: D1=4 car (2 powered,2 trailer) D2=3 car (2 powered,1 trailer) D3=2 car (Power/trailer) D4= all vehicles powered (power twin,single car etc) D5= Intercity/Transpennine unit The number does not necessarily indicate the number of vehicles in the formation.The sectional appendix will show the formations permitted for each route but not necessarily the actual formations typically used. I have looked at the Simsig list but this is not strictly speaking correct ,as it simply shows the timing load = number of vehicles in formation. e.g In the 1980's in the West county, Laria's allocation was entirely Class 118 with a few Class 121 units.If you look at the WTT you will see a D1(T) which was for the morning Barnstaple train which was a 118 with a parcel van. All other workings which were 118 are described as D2. The only exception to this was the Gunnislake branch which you will see a D3 timing load.This branch was regularly worked by a two car 118 (P480 had its trailer removed). Some workings were pairs of units which still had the same timing load. In the Trent area a lot of Skegness workings were class 116 4 car units which are given e D1 timing load or D3 for trains typically worked by the 2 car class 114's. If your doing a timetable which is either before your time or not something you have experience of,I find its often best to see if you can glean some local information (photos/books etc)as to the usual formations. Log in to reply The following user said thank you: officer dibble |