class 24 class 25 details
Basic Details
Class 24 & 25

Particulars for both Class 24 & 25

Wheel arrangement: Bo-Bo
Length over buffers: 50ft 6in
Height over cowl: 12ft 8in
Width: Class 24 - 9ft 1.375in; Class 25 - 8ft 1.625in
Total Wheelbase: 36ft 6in
Bogie Wheelbase: 8ft 6in
Bogie Pivot Centres: 28ft 0in
Minimum curvature: 4.5chains (297ft) radius
Length over buffers: 50ft 6in
Wheel Diameter: 45in

Class 24

Total Built: 151
Builders: British Railways Workshops:

Derby: 5000 - 5029, 5066 - 5075, 5114 - 5150
Crewe: 5030 - 5065, 5076 - 5093
Darlington: 5094 - 5113
Delivered: August 1958 - February 1961
Service Life: August 1958 - October 1980
Traction Motor Gear Ratio: 81 : 16
Engine Continuous Rating: 1,160hp at 750rpm
Power absorbed by auxiliaries (average): 65bhp
Maximum Tractive Effort at rail: 40,000lbs (24.2% adhesion)
Maximum Current: 2,340amps
Continuous Tractive Effort at rail: 21,300lbs at 16.5 mph
Continuous Generator rating: 720kW, 525 volts, 1,400 amps; 750 volts 980 amps
Maximum Speed: 75 mph
Fuel Tank Capacity D5000 - D5049: 630 gallons
Fuel Tank Capacity D5050 - D5150: 520 gallons
Auxiliary Fuel Tank Capacity D5000 - D5049: 20 gallons
Auxiliary Fuel Tank Capacity D5050 - D5150: 10 gallons
Boiler Water Capacity D5000 - D5049: 600 gallons
Boiler Water Capacity D5050 - D5150: 520 gallons
Cooling Water Pressure (engine running): 15 lb/sq in
Water Temperature: max 185F, normal 165F - 175F
Lubricating Oil Capacity: 100 gallons
Lubricating Oil Temperature: max 185F, normal 160F - 170F
Engine Oil Pressure (full power): 50 lb/sq in
Charging Air Pressure (full power): 9-12 lb/sq in
Exhaust Temperature: All cylinders to be within 100F of each other
Engine: Sulzer 6LDA28A pressure-charged four stroke
Main Generator: AEI Type RTB 15656
Traction Motors: 4 x AEI Type 137BY or BX
Steam Generator D5000 - D5003: Type OK4616A
Steam Generator D5004 - D5043: Type OK4616B
Steam Generator D5044 - D5150: Type L4610

Two rung bogie mounted footsteps from new: 5000 - 5029 (Derby), 5030 - 5049 (Crewe 5040 & 5047 assumed - can't find early photo), (but liable to change later as locomotives received repairs), (review incomplete).
Ridge sided sandboxes from new: 5000 - 5150 (but liable to change later as locomotives received repairs).
Athermos axleboxes from new: 5010 - 5019.
Athermos axleboxes bogie exchanges: 5000 (fitted circa 1969/70), 5064 (noted 1971 & 1975).
Full size fuel & water tanks from new: 5000 - 5049 (but liable to change later in order to reduce axle loadings).
Smaller fuel tank & full size water tank from new: 5050 - 5120 (but liable to change later in order to reduce axle loadings).
Smaller size fuel & water tanks from new: 5121 - 5150 (but liable to change later in order to reduce axle loadings).
Additional headcode disc brackets fitted (for use with SR six disc headcodes): 5001, 5002, 5003, 5004, 5005, 5006, 5007, 5009, 5010, 5011, 5012, 5014, 5017.
Gangway doors never removed: 24016, 24021, 24026 (No.2 end only), 24027, 5028, 24029, 24031, 24033, 24041 (No.2 end only), 24042, 5043, 24045, 24046, 24049 (No.1 end only), 24050, 24056, 24059, 24061, 24062, 24064, 5067, 24074, 24075, 24076, 24077, 24085, 5088, 24090, 24092, 24137, 24141, 24144, 24146
Headcode discs centered on cab front (Glasgow modification): 24001, 24002, 24003, 24004, 24005, 24006, 24007, 24009, 24010, 24065, 24066, 5068, 24069, 24070, 24071, 24073, 24094, 24096, 24097, 24098, 24099, 24100, 24101, 24102, 24103, 24106, 24107, 24108, 24109.
Modified Headcode boxes - with sloped sides: 24147 (both cabs), 24148 (both cabs)
Modified Headcode boxes - Class 24/1 style : 24049 (No.2 cab)
Livery: two numbers & two emblems each side (from 1967 - 1968 shoppings): 5022, 5025, 5027, 5028, 5034, 5049, 5068 (non-standard), 5078, 5080, 5084, 5086, 5099, 5106, 5112, 5113, 5139, 5146, 5150
Livery: carried green livery with TOPS numbering: 24032, 24035, 24042, 24047, 24057, 24063, 24069, 24071, 24081, 24090, 24092, 24110, 24136 & 24147.
Livery: two-tone green (ex-Derby): 5005, 5036, 5037, 5038, 5040, 5053, 5054 & 5072.
Livery: number on bodyside (ex-Glasgow): 24009.
Royal Train cabling modification (cab front circular access point): 24082.
Boiler water tank removed whilst on Southern Region: 5003, 5004, 5005, 5006.
Boiler water tank removed permanently: 24032, 24034, 24035, 24039, 24063, 24080, 24081, 24086, 24091, 24102 - 24111, 24134
Original exhaust port covered but not immediately removed: 5044, 5056, 5058, 5059, 5066, 5068.
Cab roof ventilators sheeted over (Eastern Region modification): 5036, 5037, 5038, 5039, 5040, 5041, 5042, 5043, 5048, 5051, 5053.
Circular gauge added to fuel/water tank: 24006 (F), 24008* (F), 24009* (F), 24022 (F), 24025* (F), 5028 (F), 24034* (F), 24038* (F), 24046 (F/W), 24049 (F/W), 24052* (F/W), 24054* (F/W), 24078* (F/W), 24080* (F/W), 24084* (F/W), 24086* (F/W), 5093 (F), 24099* (F/W), 24102* (F), 24106 (F), 24107* (F), 24112* (F/W), 24113* (F/W), 24115* (F/W), 24116* (F/W), 24117* (F/W), 24121 (F/W), 24127* (F), 24128* (F/W), 24129* (F/W), 24137* (F/W), 5139 (F), 24141* (F), 24143* (F/W), 24146* (F/W), 24148* (F/W)
Battery Isolating Switch Cover modification (one hinged door): 24119, 24120, 24126, 24128, 24129, 24132.
Battery Isolating Switch Cover modification (three circular flaps): 24066, 24071 & 24123.
Tripcock fitted (Eastern Region modification): 5054, 5057, 5058, 5060, 5065, 5067, 5070.
Preserved Class 24s: 24032, 24054, 24061, 24081 (total of four).

Class 25

Total Built: 327
Builders: British Railways Workshops: Derby, Darlington; and Beyer Peacock Ltd, Manchester

Darlington: 5151 - 5185, 5223 - 5232, 7578 - 7597
Derby: 5186 - 5222, 5233 - 5299, 7500 - 7577, 7598 - 7623, 7660 - 7677
Beyer Peacock: 7624 - 7659
Delivered: April 1961 - May 1967
Service Life: April 1961 - March 1987
Traction Motor Gear Ratio 25001 - 25025: 79 : 18
Traction Motor Gear Ratio 25026 - 25327: 67 : 18
Engine Continuous Rating: 1,250hp at 750rpm
Power absorbed by auxiliaries (average): 65bhp
Maximum Tractive Effort at rail 25001 - 25025: 39,000lbs
Maximum Tractive Effort at rail 25026 - 25327: 46,500lbs
Maximum Current 25001 - 25025: 2,525amps
Maximum Current 25026 - 25327: 2,640amps
Continuous Tractive Effort at rail: 20,500lbs at 18 mph
Continuous Generator rating 25001 - 25025: 817kW, 750 volts, 1,090 amps; 545 volts 1,500 amps
Continuous Generator rating 25026 - 25327: 780 volts, 1,050 amps; 545 volts 1,500 amps
Maximum Speed: 90 mph
Fuel Capacity : 510 gallons
Boiler Water Capacity 25026 - 25028, 25033 - 25087, 25218 - 25247: 580 gallons
Lubricating Oil Capacity: 100 gallons, maximum on dipstick indicates 86 gallons
Coolant Capacity: 186 gallons
Water Temperature: max 185F, normal 165F - 175F
Engine: Sulzer 6LDA28B pressure-charged four stroke
Main Generator: AEI Type RTB 15656
Auxiliary Generator: AEI Type RTB 7440
Traction Motors 25001 - 25025: 4 x AEI Type 137BY or BX
Traction Motors 25026 - 25327: 4 x AEI Type 253AY
Traction Motor Rating 25026 - 25327: 650 amps at 315 volts
Traction Motor Gear Ratio: 67 : 18
Steam Generator 25026 - 25028, 25033 - 25087, 25218 - 25247: Stone Vapor L4610
Weight in Working Order 25026 - 25028, 25033 - 25082, 25218 - 25247: 73 tons 15cwt
Weight in Working Order 25029 - 25032: 71 tons 9cwt
Weight in Working Order 25083 - 25087: 73 tons 1cwt
Weight in Working Order 25088 - 25217, 25248 - 25327: 70 tons 14cwt
Maximum Axle Loads 25026 - 25028, 25033 - 25082, 25218 - 25247: 18 tons 17cwt
Maximum Axle Loads 25029 - 25032: 18 tons 5cwt
Maximum Axle Loads 25083 - 25087: 18 tons 12cwt
Maximum Axle Loads 25088 - 25217, 25248 - 25327: 18 tons 1cwt

Livery: carried green livery with TOPS numbering: 25006, 25036, 25038, 25040, 25043, 25044, 25054(?), 25101, 25102, 25139, 25149, 25201, 25202, 25203, 25204, 25206, 25215, 25218, 25235, 25243, 25248, 25251, 25252, 25260, 25261, 25268, 25279, 25283, 25285, 25294, 25300 & 25305.
Livery: two numbers & two emblems each side (from 1967 - 1968 shoppings): 5151, 5161, 5162, 5164, 5165, 5166, 5167, 5168, 5172, 5202, 5223, 5226, 5283, 7549, 7562, 7572, 7661, 7662, 7663, 7664, 7665, 7666, 7667, 7668, 7669 (& as 25319), 7671, 7672, 7673, 7674, 7675, 7676, 7677
Livery: large bodyside number (ex-Glasgow): 25046, 25062, 25065, 25066, 25075, 25083, 25084, 25085, 25086, 25109, 25226, 25230, 25231, 25234
Livery: number on bodyside (ex-Glasgow): 25001, 25002, 25005, 25006, 25007, 25008, 25009, 25010, 25011, 25013, 25019, 25021, 25023, 25026, 25028, 25033, 25034, 25035, 25037, 25044, 25049, 25050, 25059, 25062, 25064, 25068, 25072, 25075, 25076, 25078, 25079, 25082, 25086, 25087, 25090, 25091, 25093, 25094, 25098, 25099, 25108, 25125, 25130, 25140, 25144, 25149, 25153, 25156, 25162, 25171, 25172, 25188, 25202, 25216, 25227, 25228, 25229, 25232, 25233, 25235, 25237, 25238, 25239, 25240, 25241, 25244, 25246, 25247, 25266, 25283, 25286, 25296, 25300, 25306, (25904, 25905, 25906)
Livery: tablet catcher recesses sheeted over: 25262, 25266, 25270 (No.1 cab only), 25272 (No.2 cab only)
Modified Headcode boxes - with sloped sides (no horn receptacles): 25009 (No.1 cab only)
Modified Headcode boxes - Class 25/1 style (with horn receptacles): 25006 (No.2 cab only), 25008 (No.1 cab only), 25010 (No.1 cab only), 25015 (No.2 cab only)
Royal Train cabling modification (cab front circular access point): 25048, 25051, 25052, 25053, 25054, 25057, 25072, 25073, 25075, 25076, 25219, 25220, 25221, 25222, 25245, 25259, 25278.
Sheeted over Boiler Room Grilles: 25100, 25101, 25102, 25104, 25105, 25107, 25110, 25111, 25112, 25114, 25115, 25116, 25118, 25119, 25123, 25124, 25126, 25127, 25129, 25131, 25132, 25133, 25134, 25135, 25136, 25137, 25138, 25139, 25141, 25142, 25143, 25146, 25147, 25148, 25150, 25152, 25158, 25160, 25161, 25163, 25164, 25165, 25166, 25167, 25168, 25169, 25170, 25177, 25180, 25186, 25187, 25195, 25211, 25214, 25215, 25263, 25270, 25274, 25280, 25281, 25292, 25294, 25302
Non-standard Battery Isolating Switch Cover - three circular hinged discs: 25005, 25037, 25066, 25087, 25109, 25215, 25228, 25232
Gangway doors never removed: 25015, 25029, 25045.
Boiler Water Tank removed: 25242.
Center lampbracket & other fittings removed : 25028, 25032 (No.2 cab only lamp bracket present other fittings removed), 25033, 25034, 25035, 25036, 25037, 25041, 25042, 25043, 25044, 25046, 25047, 25049, 25050, 25051 (No.1 cab only), 25058 (No.2 cab only), 25059, 25061, 25062, 25064, 25065 (No.2 cab only), 25067, 25068, 25069, 25070, 25071, 25072, 25073, 25076, 25078, 25079, 25080 (No.1 cab only), 25081, 25082, 25089 (No.1 cab only), 25109 (No.1 cab only), 25115 (No.2 cab only lamp bracket present other fittings removed), 25116 (No.1 cab only), 25137 (No.2 cab only), 25204 (No.2 cab only), 25218, 25220 (No.2 cab only), 25221, 25223, 25224 (No.2 cab only), 25225, 25226, 25227, 25228, 25229, 25231, 25232, 25233, 25234, 25235, 25236, 25238 (No.2 end only), 25239, 25240, 25241, 25242, 25244, 25245, 25246, 25247, 25250 (No.1 cab only), 25262 (No.2 cab only lamp bracket present other fittings removed), 25269 (No.2 cab only), 25270 (No.1 cab only), 25271 (No.2 cab only), 25272 (No.2 cab only), 25296 (No.2 cab only), 25305 (No.2 cab only), 25314 (No.2 cab only), 25316 (No.1 cab only), 25322 (No.2 cab only), 25327 (No.2 cab only).
Class 25s with last Classified repair at Crewe: 25256, 25260, 25267, 25295, 25299, 25304, 25310.
Angled strip at bottom of cab doors (Glasgow modification): 25034, 25035, 25046, 25049, 25062, 25065, 25076, 25083, 25084, 25086, 25087, 25109, 25130, 25144, 25149, 25153, 25188, 25237, 25239, 25266, 25283, 25286, 25296.
Circular gauge added to fuel tank (Class 25/0 only): 25001, 25002, 25003, 25005, 25007, 25008, 25009, 25011, 25012, 25013, 25014, 25015, 25016, 25017, 25018, 25019, 25021, 25022, 25023, 25024, 25025.
Cantrail level water fillers sheeted over (Class 25/0 only): 25006
Never carried 'Domino' headcode display: 25110, 25112, 25295

Unofficial Names:
25034 Castell Aberystwyth / Aberystwyth Castle
25035 Castell Dinas Bran
25058 Castell Criccieth
25109 Castell Trefaldwyn / Montgomery Castle
25201 Castell Y Bere
25213 Castell Y Waun / Chirk Castle

Service Life:
No.1: 25037: 23 years & 309 days.
No.2: 25035: 23 years & 289 days.
No.3: 25059: 23 years & 278 days.
No.4: 25057: 23 years & 273 days.
No.5: 25058: 23 years & 260 days.
No.?: 25034: 23 years & 209 days.
No.?: 25042: 23 years & 10 days.
No.?: 25032: 22 years & 363 days.
No.?: 25109: 22 years & 358 days.
No.?: 25048: 22 years & 286 days.
No.?: 25230: 22 years & 242 days.
No.?: 25224: 22 years & 201 days.
No.?: 25095: 22 years & 195 days.
No.?: 25064: 22 years & 157 days.

Dual brake fitted withdrawals (the first 25 withdrawn):
No.1: 25077: May 1978.
No.2: 25295: June 1978.
No.3: 25204: July 1980.
No.4=: 25053: December 1980.
No.4=: 25099: December 1980.
No.4=: 25155: December 1980.
No.4=: 25183: December 1980.
No.4=: 25197: December 1980.
No.4=: 25203: December 1980.
No.4=: 25232: December 1980.
No.4=: 25222: December 1980.
No.12: 25241: May 1981.
No.13: 25082: May 1981.
No.14: 25088: September 1981.
No.15: 25246: October 1981.
No.16: 25312: June 1982.
No.17: 25318: July 1982.
No.18: 25310: October 1982.
No.19: 25036: December 1982.
No.20: 25233: March 1983.
No.21=: 25314: March 1983.
No.21=: 25319: March 1983.
No.23=: 25033: April 1983.
No.23=: 25050: April 1983.
No.23=: 25317: April 1983.

Preserved Class 25s: 25035, 25057, 25059, 25067, 25072, 25083, 25173, 25185, 25191, 25235, 25244, 25262, 25265, 25278, 25279, 25283, 25309, 25313, 25321, 25322 (total of 20).

Auction of builders plates etc (listed chronologically):
25910 flamecut panel showing the number sold at Stafford Auctions for 200 during January 2011.
24038 diesel engine details plate/Sulzer plate/Vickers Armstrong plate sold for 71 on Ebay during 2011.
24150 builders plate Derby 1961 sold at Stafford Auctions for 210 during May 2012.
25063 builders plate Derby 1963 sold at Stafford Auctions for 250 during January 2013.
25063 builders plate Derby 1963 sold at Cotswold Auctions for 220 during May 2013.
24103 builders plate Darlington 1960 sold at Sheffield Railwayana Auctions for 580 during June 2013.
24xxx builders plate Crewe 1959 sold at Great Central Railwayana Auctions for 350 during October 2013.
24xxx builders plate Darlington 1960 sold at Great Central Railwayana Auctions for 600 during October 2013.
5278 builders plate Derby 1964 sold at Great Central Railwayana Auctions for 130 during October 2013.
24xxx builders plate Crewe 1959 sold at Great Central Railwayana Auctions for 300 during January 2014.
25xxx (25035?) builders plate Derby 1963 sold at Stafford Auctions for 180 during May 2014.
25xxx builders plate Derby 1966 sold at Stafford Auctions for 150 during May 2014.
25320 builders plate Derby 1966 sold at Stafford Auctions for 200 during May 2015.
25132 builders plate Derby 1964 sold at Great Central Railwayana Auctions for 280 during June 2015.
25xxx builders plate Darlington 1963 sold at Great Central Railwayana Auctions for 400 during September 2015.
25065 flamecut panel showing the number sold at Stafford Auctions for 165 during September 2015.
24013 builders plate Derby 1959 sold at Great Central Railwayana Auctions for 220 during December 2015.
24054 builders plate Crewe 1959 sold at Stafford Auctions for 300 during January 2016.
24xxx builders plate Derby 1960 sold at Stafford Auctions for 250 during January 2016.
24xxx builders plate Derby 1959 sold at Great Central Railwayana Auctions for 220 during March 2016.
25140 builders plate Derby 1964 sold at Great Central Railwayana Auctions for 220 during March 2016.
25028 builders plate Darlington 1963 sold at Great Central Railwayana Auctions for 540 during June 2016.
25086 builders plate Derby 1963 sold at Great Central Railwayana Auctions for 380 during September 2016.
24036 builders plate Crewe 1959 sold at Stafford Auctions for 500 during September 2016.
25xxx builders plate Derby 1963 sold at Stafford Auctions for 200 during January 2017.
24xxx builders plate Derby 1960 sold at Great Central Railwayana Auctions for 400 during June 2017.
25233 builders plate Darlington 1963 sold at Great Central Railwayana Auctions for 640 during September 2017.
24062 builders plate Crewe 1959 sold on Ebay for 412 during November 2017.
25248 builders plate Derby 1966 sold on Ebay for 295 during November 2017.

(Next GCRA 12/17: Staff A 5/2017: Sheff RA 4/2014 postal)

Sources:
Operating Manual British Railways Locomotives D5000 - D5175; dated January 1962
Operating Manual British Railways Locomotives D5176 - D5299, D7500 - D7677; dated July 1966

Page added May 16th 2011
Last updated December 15th 2017

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