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Class 25/2 D7568 - D7577


johnw1

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In 1963 the BR Sulzer Type 2 design underwent two changes, the first was electrical with the introduction of GEC series 2 control equipment, the second was a re-designed body. The first ten locomotives with the new electrical equipment were built at Derby works but used the earlier bodystyle. They were for some reason numbered out of sequence and given the almost random number series D7568 - D7577 instead of the more logical D5233 which was given to the first of the locomotives with both the new electrical equipment and new bodystyle. Does anyone know why the out of sequence numbers were allocated to these ten locomotives?

 

Twenty further locomotives were built with the new electrical equipment with the earlier bodystyle by Darlington works and they were given D75xx numbers following the Derby built locomotives.

 

D7574 (25224) - 25224_1979_09_Derby

D5239 (25089) - 25089_1979_03_Cheltenham

 

 

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As far as I know the BR/Sulzer type 2s started at D5000 and ran to D5299, then D7500 onwards.

These can be broken down as D5000-D5150 for the 151 class 24s 24001-24150

Class 25/0s were renumbered from D5151-D5175 to 25001-025.

 

The class 25s then ran out of D5xxx numbers at D5299 (25149) when D5300 started the BRCW type 2s.

 

D5176-D5232 became 25026-25082 and were fitted with the bodyside grilles similar, but not the same as the class 24 design which had the grilles stand out proud of the bodyside.

D5233-D5237 became 25083-25087 which featured the new style "smooth" bodyshell but were fitted with train heating boilers similar to their predecessors.

D5238-D5299 became 25088-25149 which featured the new bodyshell,and were not fitted with train heating.

D7500-D7567 became 25150-25217 ditto

D7568-D7597 became 25218-25247 These were built by RSH Darlington works to the older design with boilers and bodyside grilles.

D7598-D7677 became 25248-25327 all to the smooth bodyside design without train heating

 

 

Quite why the Darlington batch returned to the earlier design must have a valid reason, even if the British Railways workshops at Derby sent RSH the "earlier" drawings. I've never checked whether the D7568-D7597 batch were delivered prior to D7500-D7567, but I doubt it.

 

HTH

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D5233-D5237 became 25083-25087 which featured the new style "smooth" bodyshell but were fitted with train heating boilers similar to their predecessors.

D5238-D5299 became 25088-25149 which featured the new bodyshell,and were not fitted with train heating.

D7500-D7567 became 25150-25217 ditto

D7568-D7597 became 25218-25247 These were built by RSH Darlington works to the older design with boilers and bodyside grilles.

D7598-D7677 became 25248-25327 all to the smooth bodyside design without train heating

 

 

Quite why the Darlington batch returned to the earlier design must have a valid reason, even if the British Railways workshops at Derby sent RSH the "earlier" drawings. I've never checked whether the D7568-D7597 batch were delivered prior to D7500-D7567, but I doubt it.

 

Afraid I need to correct you, the class 25/2 sub class were built as follows:

 

D5233 was built at Derby and delivered in December 1963 and the series finished with D7567 delivered in January 1966

D7568 - D7577 were built at Derby and delivered between September and November 1963

D7578 - D7597 were built at the BR Darlington works (not Robert Stephenson and Hawthorn - RSH) and delivered from November 1963 and August 1964.

 

Hence my original question

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According to Last Years of the Class 25s (Ian Allan, 1985), page 10, "By now several works were building the locomotives at the same time. This resulted in an anomaly in the numbering system." It later says "D7568-7597 were built at Darlington."

 

I can find no other information helpful! Indeed, I've always thought that D7568 were all built at Darlington - and that works' slowness compared to Derby (so they were still working to the old specification after Derby had moved on) the sole reason for the anomaly. So the info that D7568-7577 were built at Derby is new to me.

 

Regardless of the which works built them, the strange numbering would, I thought, have just been down to which order got completed first - in the same way that Swindon completed 92220 after Crewe's 92250?

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Regardless of the which works built them, the strange numbering would, I thought, have just been down to which order got completed first - in the same way that Swindon completed 92220 after Crewe's 92250?

 

May well be the answer, however I still fail to see why the "non standard" class 25/2 locomotives (i.e. with the original bodystyle) were numbered at the end of the class 25/2 series and not at the start. To my mind the logical sequence would have been for the thirty "non standard locomotives" to have carried on from the class 25/1 series and would have become D5233 - D5262 and the new bodystyle starting with D5263. In mid 1963 had all the class 25/2 been placed?

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Try www.derbysulzers.com .

 

Geoff Endacott

 

Hello.

 

As I was reading the earlier posts, I was thinking that myself.

 

I do recall that the batches for Class 25 became 'confused' with the private builder going out of business(?) and was unable to complete their allocated batch plus I believe that Darlington was also being run down, so Derby and/or Crewe picked up additional work that wasn't expected (or anticipated) in order to construct the entire ...erm... order of these locos.

 

Hope this helps,

 

 

David.

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Hi

 

I have read somewher of 1 25/2 style bodyshell 25 that didn't have train heating so had cutaway tanks like the 25/3's, but, I can't recall which one it was and where I saw the info!!! don't know if it comes into the number series you arer looking at though.

 

ian

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