Testing
the prototype HST in 1973
Often said
to have been a stopgap before the introduction of the Advanced Passenger
Train, the prototype High Speed Diesel Train (HSDT), as it was
originally known, owed a great deal of its design to the Western Region
of BR. A large number of design staff at the RTC in the early 1970's
came from Swindon and the BT10 (or DOC3) bogie was certainly of WR
parentage. The power cars were equipped with Paxman Valenta 12RP200L, 2,250 HP 12-cylinder marine engines chosen for their high power to weight ratio but although the vehicles had been built with sufficient room for a much larger 16-cylinder version these were never fitted. Authorised in August 1970, only 22 months later the prototype vehicles arrived at the RTC in the summer of 1972 where they underwent safety checks in the specialist workshop. Later the train was instrumented prior to starting its intensive and stringent type testing. |
Click on the picture for a bigger image - All photos are the author's unless otherwise credited.
Once the power cars were completed at Crewe they were hauled to Derby where they were assembled with the Mk3 coaches which were built in the C&W Works to form the complete unit. For some details of the train consist and what happened to the vehicles look here |
The unit underwent a number of high speed runs on the ECML between York and Darlington commencing on 5th May 1973. During June the set ran up to 140 mile/h and on June 12th attained a world speed record for diesel traction of 143.2 mile/h in the Northallerton area. The emblem at the head of the page is taken from the special commemorative tie which was issued after the event. |
In service Following completion of over 100,000 miles during its type testing and evaluation phase, mainly run on ECML the unit moved to the WR in late 1974 and entered passenger service on the Western Region of BR on 5th May 1975 running initially between London Paddington, Bristol and Weston-Super-Mare |
Shildon 1975 The HST was included in the celebrations to mark 150 years since the opening of the Stockton & Darlington Railway at Shildon, Co. Durham on 31st August 1975 where it was the last in the cavalcade of rolling stock. |
Following the widespread introduction of production HST's the prototype power cars were withdrawn from service in late 1976 and returned to the RTC at Derby where they were taken into Departmental stock. They were re-numbered as ADB975812/3 and used for a number of years to haul various test trains. There was even talk of converting them to straight electric traction when the 'electric HST' was being considered, but it was not to be. Second life |
![]() |
Here is the
prototype short-formed at Holwell on the
Old Dalby test track whilst
undertaking some test work in the mid-1970's
Alan Rimmer |
![]() |
On 17th May
1978 one of the power cars heads a test train with two APT-P power cars
in the formation through Wigan North Western station.
David N Clough |
![]() |
Another view of the APT-P
power car test train leaving Derby on an unknown date Authors collection |
![]() |
Here a special test train is
pictured at Sydney Gardens, Bath in July 1978 with one of the power cars
and including Lab One in the formation Ivo Peters |
![]() |
Another test train is
pictured at Derby with the prototype power cars and some APT-P vehicles
in March 1979. Garry Brookes |
![]() |
The two powers cars pictured
on the Way & Works sidings at Derby in the late 1970's Unknown |
![]() |
Here are the two power cars,
now in departmental use, pictured on the Goods lines outside the
Locomotive Works at Derby in April 1980
Dave Godfrey |
![]() |
The two power cars were
often stabled at the back of Etches Park depot in Derby, where they were
pictured in April 1980.
Dave Godfrey |
![]() |
A close up of one of the
power cars shows that it now has two headlights fitted behind the front
panel - possibly for test train work, the original set number has now
been removed but it carries no departmental number.
Dave Godfrey |
![]() |
In March 1983 the two power
cars are pictured out of use on the scrap road at Derby Locomotive
Works. Their fate would be quite different, one was scrapped at
Rotherham in 1990 and the other still survives today as part of the
national collection at NRM and is now fully operational and based at the
Great Central (Nottingham) Railway ay Ruddington. Adrian Healey |
![]() |
In October 1986 975813 was
still to be found inside the works, alongside one of the APT-P power
cars, both awaiting their fate.
John Glynn |
![]() |
The surviving power car is
pictured back at Old Oak Common, 26 years after the previous OOC photos,
attending the August 2000 open day
Duncan Milburn |
Preservation
Plans were announced by the 125 Group in May 2011 to return 41001 to service, under the banner of Project Miller (named after Terry Miller, formerly Chief Engineer (Traction & Rolling Stock) for British Rail). The power car was on long term loan based at the Great Central (Nottingham) Railway at Ruddington but in July 2019 the vehicle was recalled by NRM due to 'repeated breaches of the conditions' in the loan agreement What a shame it won't be seen on the main line or preserved railways in future! |
![]() |
At the GCR and fully
restored Paul Biggs |
More pictures will be added as time permits |