BR diesel and electric bogie loco wheel and wheelbase information

drawing of different wheelbase configurations

by Ted Scannell, Keith Norgrove, Simon Bendall, Alan Monk and Russ Elliott

Drawn and edited by Russ Elliott

 

Locos

General notes:


Explanation of symbols:

 a distance between midpoints of bogies (for B-B and Bo-Bo) or between centre axles for 3-axle bogies (please note that the points of this dimension may not be the same as the bogie pivot points – see relevant footnotes)
 b Bo-Bo (or B-B) bogie wheelbase
 c1 outer to centre axle distance on 3-axle bogies
 c2 centre to inner axle distance on 3-axle bogies
 c3 outer powered axle to pony distance on 1Co-Co1 configuration
 d powered wheel diameter
 dc carrying wheel diameter (either a pony or the centre wheel on the bogies of an A1A-A1A)

TOPS class Pre-TOPS number (class) Wheel arrangement Wheelbase dimensions Wheel diameters Wheel type
  a   b   c1   c2   c3   d   dc
- 26500/1 (ES1) 1 Bo-Bo 20 '6" 6 '6" - - - 3' 0" - disc (?)
- 26510 etc (EB1, EF1) 1 Bo-Bo 18' 3" 8' 9" - - - 4' 0" - 12 (?)-spoke
- 10000/1 Co-Co 35' 2" 2 - 8' 0" 7' 8" - 3' 6" - disc
- 10201/2/3 1Co-Co1 28' 6" - 8' 0" 8' 0" 5' 6" 3' 7" 3' 1" disc
- 10800 Bo-Bo 22' 6" 8' 6" - - - 3' 6" - disc
- 18000 A1A-A1A 38' 0 ¾" - 5' 10 ⅞" 5' 10 ⅞" - 4' 0 ½" 3' 2" 14-spoke 3
- 18100 4 Co-Co 37' 6" - 7' 6" 7' 6" - 3' 8" - disc
15 D8200-43 Bo-Bo 22' 6" 8' 6" - - - 3' 3" 5 - disc
16 D8400-9 Bo-Bo 20 '0" 8' 6" - - - 3' 7" - 10-spoke 3
17 D8500-616 Bo-Bo 28' 0" 8' 6" - - - 3' 3 ¾" - disc
20 D8000-99/8300-27 Bo-Bo 24' 0" 8' 6" - - - 3' 7" - disc
21, 29 D6100-57 Bo-Bo 28' 6" 8' 6" - - - 3' 7" - 11-spoke 3
22 D6300-57 B-B 23' 0" 8' 6" - - - 3' 7" - 11-spoke 3
23 D5900-9 Bo-Bo 32' 0" 8' 6" - - - 3' 7" - disc
24, 25 D5000-99/7500-677 Bo-Bo 28' 0" 8'6" - - - 3' 9" - disc
26, 27 D5300-415 Bo-Bo 29' 0" 10' 0" - - - 3' 7" - disc
28 D5700-19 Co-Bo 32' 5" 6 8' 6" 5' 11" 7 6' 2 ½" 7 - 3' 3 ½" - disc
30, 31 D5500-699/5800-62 A1A-A1A 28' 10" - 7' 0" 7' 0" - 3' 7" 3' 3 ½" disc
33 D6500-97 Bo-Bo 29' 0" 10' 0" - - - 3' 7" - disc
35 D7100-100 B-B 25' 6" 10' 6" - - - 3' 9" - disc
37 D6600-8/6700-999 Co-Co 37' 2" - 6' 9" 6' 9" - 3' 7" 8 - disc
40 D200-399 1Co-Co1 34' 3" 9 - 8' 0" 8' 0" 5' 6" 3' 9" 3' 0" disc
41 D600-4 A1A-A1A 35' 0" - 7' 6" 7' 6" - 3' 7" 3'3 ½" 11-spoke 10
42, 43 D800-70 B-B 37' 9" 10' 6" - - - 3' 3 ½" - disc
HST41, 43 - Bo-Bo 10300mm 2600mm - - - 1020mm - disc
44, 45, 46 D1-193 1Co-Co1 32' 8" - 8' 0" 8' 0" 5' 6" 3' 9" 3' 0" disc
47, 48 D1500-999 Co-Co 37' 0" - 7' 3" 7' 3" - 3' 9" - disc
50 D400-49 Co-Co 42' 8" - 6' 9" 6' 9" - 3' 7" - disc
52 D1000-73 C-C 42' 6" - 6' 1" 6' 1" - 3' 7" - disc
- (Lion) D0260 Co-Co 36' 3" - 7' 3" 7' 3" - 3' 9" - disc
53 (Falcon) D0280/D1200 Co-Co 42' 0" - 7' 2" 7' 9" - 3' 7" - disc
- Deltic (prototype) Co-Co 44' 0" - 7' 2" 7' 2" - 3' 7" - disc
- DP2 Co-Co 45' 0" - 6' 9" 6' 9" - 3' 7" - disc
55 D9000-21 Co-Co 45' 0" - 6' 9" 6' 9" - 3' 7" - disc
- (Kestrel) HS4000 11 Co-Co 37' 2" - 7' 3" 7' 8" - 3' 7" - disc
56 - Co-Co 37' 8" 12 - 6' 4 ¾" 7' 0 ¾" - 3' 9" - disc
57 - Co-Co 37' 0" - 7' 3" 7' 3" - 3' 9" - disc
58 - Co-Co 10800mm 13 - 2030mm 2150mm - 1120mm - disc
59 - Co-Co 43' 6" - 6' 7 ¼" 6' 11 ¾" - 3' 6" 14 - disc
60 - Co-Co 42' 9 ¾" - 6' 9 ¼" 6' 9 ¼" - 3' 7" - disc
66 - Co-Co 43' 6" - 6' 7 ¼" 6' 11 ¾" - 1120mm 15 - disc
67 - Bo-Bo 38' 1" 16 9' 2" 16 - - - 3' 2" - disc
70 23 20001/2 Co-Co 27' 6" - 8' 0" 8' 0" - 3' 7" - disc with holes
70 23 20003 Co-Co 28' 6" - 8' 0" 8' 0" - 3' 7" - disc with holes
70 70 001 onward Co-Co ? - ? ? - 1067mm - disc
- E1000 A1A-A1A ? - 7' 6" 7' 6" - 3' 8" 3' 8" disc
71, 74 E5000-24 17 Bo-Bo 27' 0" 10' 6" - - - 4' 0" - 11-spoke 22
73 E6000-49 (JA/JB) Bo-Bo 32' 0" 8' 9" - - - 3' 4" - disc
76 26000 (EM1) Bo-Bo 23' 6" 11' 6" - - - 4' 2" - 12-spoke 18
77 27000-6 (EM2) Co-Co 30' 2" 19 - 8' 0" 7' 8" - 3' 7" - ?
81 E3001-23/96/97 (AL1) Bo-Bo 31' 6" 10' 9" - - - 4' 0" - disc
82 E3046-55 (AL2) Bo-Bo 30' 9" 10' 0" - - - 4' 0" - disc
83 E3024-35/98-100 (AL3) Bo-Bo 30' 0" 10' 0" - - - 4' 0" - 12-spoke
84 E3036-45 (AL4) Bo-Bo 29' 6" 10' 0" - - - 4' 0" - disc
85 E3056-95 (AL5) Bo-Bo 31' 6" 10' 9" - - - 4' 0" - disc
86 E3101-200 (AL6) Bo-Bo 32' 9" 10' 9" - - - 3' 9" 20 - disc
87 - Bo-Bo 32' 9" 10' 9" - - - 3' 9 ½" - disc
89 - Co-Co 10900mm 21 - 2100mm 2300mm - 3' 6 ½" - disc
90 - Bo-Bo ? ? - - - 3' 9 ½" - disc
91 - Bo-Bo ? ? - - - 3' 3 ½" - disc
92 - Co-Co ? - ? ? - 1160mm - disc
251 Blue Pullman Bo-Bo 46' 6" 9' 6" 24 - - - 3' 6" - disc
Footnotes:
 1 Ex-NER electric locos.
 2 35' 2" is the dimension between centre axles. Bogie pivot points were 2" outboard of each centre axle.
 3 Source (for Class 22): Traction magazine, issue 62. The Graham Fenn drawing, indicating 10 spokes, would appear to be incorrect. It is thought that all NBL locos had 11 spokes, so this would include Classes 21, 29 and 41.
 4 18100 was rebuilt as E1000 with 2 motors removed, making it an A1A-AIA (source: R S Carter).
 5 3' 3 ½" according to the text of the R S Carter book, but drawing shows 3'3".
 6 32' 4" between pivot centres – the pivot centre is 1" inboard of the centre axle of the Co bogie.
 7 Marsden & Fenn quotes 12' 2 ½" as the total wheelbase of the Co bogie. The GA in BR Fleet Survey ( Ian Allan) shows 12' 1 ½".
 8 Incorrectly stated as 3' 9" in  British Rail Main Line Diesel Locomotives, Colin Marsden and Graham Fenn, OPC, ISBN 0 086093 318 0. (and on the drawing in the book's revision – ISBN ....)
 9 Source R S Carter. Marsden & Fenn quote 34'4" as the bogie pivot centres. Dimension between centre axles is likely to be very close to this.
10 Originally fitted with spoked wheels, probably 11-spoke as per Class 22, on all axles. Fitted later with disc wheels.
11 Kestrel was later fitted with standard class 47 bogies.
12 37' 8" is the dimension between bogie pivot centres. Centre axle to centre axle dimension,  a, is approximately 35'.
13 10800mm is the dimension between centre axles. The "traction centre" is 545mm outboard of each centre axle.
14 Scales at approx 3' 9" on the Graham Fenn drawing in the original edition of the Marsden & Fenn book.
15 3' 6" according to revised Marsden & Fenn book.
16 Information taken from manufacturer's data, which is given in both metric and imperial values. The drawing in the Marsden & Fenn book would appear to be incorrect on both bogie wheelbase and overall wheelbase.
17 E5000-24 became class 71. Ten were rebuilt as electro-diesel E6101-10, then 74001-10.
18 Source R S Carter.
19 30' 2" between bogie centre axles. Bogie pivots are 2" outboard of each centre axle.
20 Probably 3' 9" for majority of class. R S Carter states 3'9 ½".
21 10900mm between bogie centre axles. Bogie pivots are 75mm inboard of each centre axle.
22 Estimated from photos.
23 As originally classified.
24 For all leading and drive bogies. All non-driving bogie wheelbases are 8' 6" (also with 3' 6" wheels).



DMUs and DEMUs

TOPS class (or pre-TOPS description) Bogie centres, a Bogie wheelbase, b Wheel diameter, d
Derby Lightweight, Metro Cammell (original), 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 129 40' 0" 8' 6" 3' 0"
114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128 46' 6" 8' 6" 3' 0"
201 40' 0" 8' 9" (drive bogie)
8' 6" (non-driving bogie)
3' 4" 1
202, 203, 204, 205, 206, 207 46' 6" 8' 9" (drive bogie)
8' 6" (non-driving bogie)
3' 4" 1
1   Wheel diameter on non-driving bogies was 3' 6"



EMUs

(to follow)



4-wheel railbuses *


All wheels are 3' 0" diameter

*  These are not bogie vehicles, but are included on this page for the sake of completeness
Manufacturer Wheelbase
BUT (1952)
(formed in a 3-car set)
22' 0"
Bristol ECW 22' 0"
Waggon und Maschinenbau 19' 8¼"
Wickham 19' 0"
Park Royal 19' 8¼"
AC Cars 18' 11"



History:
- First published July 2000
- Class 67 information corrected January 2002
- deletion of broken external link (for class 67) September 2005
- correction of number (11) of spokes for Class 22 wheels, June 2006
- correction of number (11) of spokes for Class 21/29 wheels, October 2006
- clarification of number of spokes for Class 41, March 2008
- clarification of number of spokes on Class 71, July 2008
- new class 70 added 9 September 2010
- 1st gen DMU information started 23 February 2011
- DEMU wheel diameter clarified 24 February 2011