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Class 253 and Class 254 were the classifications allocated to the production High Speed Train units. The former class was used for Western Region sets, operating out of London Paddington, and the latter for Eastern Region sets, operating out of London King's Cross, since these regions used different formations - the Western Region [WR] used 2+7 sets, whilst the ER preferred 2+8 sets with a second buffet car. This article or section does not cite its references or sources. ...
History
When originally built, from 1976, the InterCity 125 (125) units were considered to be Diesel Electric multiple units, with semi-fixed formations of power cars and intermediate passenger-carrying trailer cars. They were all numbered in the carriage series, in the 4xxxx series set aside for HST and Advanced Passenger Train vehicles. Numbers followed those allocated to the prototype Class 252 unit, so for instance, power cars were numbered from 43002 upwards. An InterCity 125 train (often referred to as High Speed Train or HST) is a formation of two Class 43 power cars with a rake of Mark 3 carriages in between. ...
A multiple unit is a passenger train whose carriages have their own motors, either diesel (DMUs) or electric (EMUs), and do not need to be hauled by a locomotive. ...
The Advanced Passenger Train (APT) was an unsuccesful prototype tilting train developed by British Rail during the 1970s and early 1980s. ...
Class 252 was the classification allocated to the prototype High Speed Train unit, numbered 252001. ...
This situation changed in the 1980s, since when the power cars have been considered to be locomotives, known as Class 43, and the trailer cars as hauled Mark 3 carriages, collectively known as an InterCity 125. Despite this change in designation, no power car or carriage was renumbered. Great Western Railway No. ...
HST power car 43127 is shown here crossing the Kennet and Avon Canal The British Rail Class 43 is the classification used for the InterCity 125 High Speed Train power cars, built by BREL from 1976 to 1982 The class are officially the fastest diesels in the world, with an...
Mark 3 DVT at Norwich station British Rails third design of carriages was designated Mark 3. ...
An InterCity 125 train (often referred to as High Speed Train or HST) is a formation of two Class 43 power cars with a rake of Mark 3 carriages in between. ...
In 2002, Class 255 was allocated for the reformation of certain HST power cars and trailers into semi-fixed formation trains, to be known as Virgin Challenger units, for use by Virgin Trains after the introduction of their new 'Voyager' trains (Classes 220 and 221). These formations would have involved power cars sandwiching one Trailer First, a Trailer Buffet, two Trailer Seconds and a Trailer Guard Second. However, these plans came to naught as the Strategic Rail Authority planned to transfer most of the stock to Midland Mainline for their London-Manchester 'Rio' services. A Class 220 Voyager at Bristol. ...
A Class 220 Voyager stops at York station. ...
Class 255 Was carried in the late 1970s/early 1980s by some Eastern and Sc Region 9-trailer formation HSTs
Formation The vehicle types used to form High Speed Trains are listed below: | Number Range | Type | Notes | | 400xx | Trailer Buffet (TRSB) | Renumbered to 404xx in 1983; some converted to 402xx series | | 403xx | Trailer Buffet (TRUB) | All converted to 407xx series (designated first class) | | 405xx | Trailer Kitchen (TRUK) | All withdrawn and converted for other uses | | 41xxx | Trailer First (TF) | Majority in service, some converted or scrapped | | 42xxx | Trailer Second (TS) | Majority in service, some converted or scrapped | | 43002-43198 | Driving Motor (Brake) (DM or DMB) | Majority in service, three scrapped after accidents | | 44000-44101 | Trailer Guard Second (TGS) | Majority in service, some converted | |
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