Talk:British Rail Class 09

Technical data

The main text says the higher speed was obtained by a change of gearing and hence reduced the tractive effort, while the infobox gave the same tractive effort as an 08 (35,000lbf). I have changed this to 25,000lbf as given at [1], which fits with an increase in speed from 20mph to 27.5mph.

This source also disagrees with the power (see Talk:British Rail Class 08#Power), minimum curve and build year, but I have left these unaltered as I do not know which is right.

Also, the figures around 50 in the subclasses section are presumably weights, but are they in metric or imperial tons? --QuantumEngineer (talk) 15:10, 8 September 2010 (UTC)

It's a mess, isn't it? I know of no unit abbreviated to "te"; but the metric equivalents shown in kN (kilonewtons) suggest a measure force, which in imperial units would be lbf. If it's a weight, the only valid metric measures are kg or tonnes.

Various publications over the years have disagreed with each other as regards the true figures for various characteristics of D3000-D4192, and also disagree on the "real" distinction that merits a loco being assigned to Class 09 instead of 08. For instance,

• Strickland, D.C. (1983). D+EG Locomotive Directory. Camberley: Diesel & Electric Group. p. 53. ISBN 0 906375 10 X. {{cite book}}: Unknown parameter |month= ignored (help)

which, if you piece together disjoint data, gives

Class 08 (D3127 up only): 350 bhp (later 400 bhp by increased rpm) weight 48t, tractive effort 35,000 lbf, max speed 20 mph (later reduced to 15 mph except for SR locos)

D3665-71,D3719-21,D4099-114 (ie Class 09) 27+1⁄2 mph

that is, the same power, weight and tractive effort are given for class 09 as 08. --Redrose64 (talk) 19:54, 8 September 2010 (UTC)

Build year. Same book as above has 1959 for D3665-71, D3719-21; 1961 for D4099-4112; 1962 for D4113/4. This is corroborated by

• Marsden, Colin J. (1984). BR Locomotive Numbering. Shepperton: Ian Allan. pp. 144, 146, 162. ISBN 0 7110 1445 0. EX/1184. {{cite book}}: Unknown parameter |month= ignored (help)

--Redrose64 (talk) 20:03, 8 September 2010 (UTC)

I access to refs 'Locomotives & coaching stock 1985' (and 2005 version). Quoted data for all 09 /0/1/2: weight '50 t' (I assume t=tonnes and T=tons), RA of 5, engine power 400hp/298kW, tractive effort: max 25000lb (111kN), cont. 8800lb (39kN), max speed 27mph. Build date for originals 1959-62. I'm not saying these are THE figures but does back up some of the details under question? —Preceding unsigned comment added by 86.135.244.99 (talk) 10:14, 4 January 2011 (UTC)

Possible change to the title of this article

This article is currently named in accordance the Wikipedia:WikiProject UK Railways naming conventions for British rolling stock allocated a TOPS number. A proposal to change this convention and/or its scope is being discussed at Wikipedia talk:WikiProject UK Railways#Naming convention, where your comments would be welcome.

Merge with Class 08 Article?

Should this be merged with the Class 08 article? They are, after all, essentially the same type of loco just with minor differences for operational reasons. 157.203.254.1 (talk) 09:05, 17 March 2011 (UTC)

Tables

I am adding some tables to match the British Rail Class 08 article. They may look untidy to begin with but please be patient. I will tidy up as soon as possible. Mock wurzel soup (talk) 21:44, 26 November 2017 (UTC)

I have finished adding the tables. The layout may not be ideal so suggestions for improvement are invited. Mock wurzel soup (talk) 23:27, 26 November 2017 (UTC)