British Rail Derby Lightweight

The first units were introduced on services around the West Riding of Yorkshire, namely Leeds to Bradford and Harrogate services from 14 June 1954.{{cite magazine |magazine=The Railway Magazine |date=June 1954 |page=369 |editor-first=B.W.C. |editor-last=Cooke |publisher=Tothill Press |location=Westminster |number=638 |volume=100 |title=B.R. Lightweight Diesel Trains }} Subsequent units were introduced onto services in West Cumbria, Lincolnshire, Norfolk, Newcastle to Middlesbrough, Edinburgh to Glasgow{{cite magazine |magazine=The Railway Magazine |date=July 1954 |page=458 |editor-first=B.W.C. |editor-last=Cooke |publisher=Tothill Press |location=Westminster |number=639 |volume=100 |title=Lightweight Diesel Trains for British Railways }} and, later, Birmingham to Sutton Coldfield, Bletchley to Buckingham and Banbury, and East London lines services. They were also the last units to run on the Anglesey Central Railway which closed to public traffic in 1964.

These units were extremely successful, helping to reduce the operating costs of branchlines and also attracting many more passengers when new. They carried 800,000 more passengers on the London Midland Region between February and October 1956 than steam did in the same period of 1955. The largest increase was 434% (4,772 passengers) on the Buckingham-Banbury line (from 13 August), followed by Birmingham-Lichfield 178% (from 5 March), Bury-Bacup 152% (from 6 February), Llandudno-Blaenau Ffestiniog 39% (from 5 March) and Manchester-Buxton 38% (from 8 October).{{cite magazine|title=|magazine=Railway Magazine|issue=|date=February 1957|page=74}}

Due to their success, British Railways ordered many more DMU vehicles from various builders over the next decade, thus helping to eliminate steam locomotives. However, as these units were non-standard compared to other later DMU vehicles, they were subject to early retirement. The units with hydraulic transmission were withdrawn in 1964, and the last of the remaining units were withdrawn from normal traffic in 1969.

Four different sorts of formation were created from the 217 cars built of this type, as follows:

79683 was left over as a spare DTCL, and took the place of 79649 in 1957, when this was converted into a special saloon on diagram 565. It was later renumbered 999510 in the departmental saloon series and was eventually scrapped in 1981.

In 1962 three of the power twin units were converted to power trailer units, when 79191–79193 were rebuilt as DTCL vehicles and renumbered 79633–79635.

• Engine: Two BUT (Leyland) 125 bhp
• Transmission: Hydraulic, Lysholm-Smith (Leyland) torque converter
• Coupling code: Red triangle

• Engine: Two BUT (AEC) 150 bhp
• Transmission: Mechanical
• Coupling code: Yellow diamond

A number of cars from these units were subsequently transferred to departmental (non-revenue earning) use after withdrawal from normal service:

• 79018 + 79612 were rebuilt as an ultrasonic test train based at Reading, numbered 975007 + 975008. Replaced by unit 901001.
• 79900 was rebuilt as test coach "Iris", based at Bletchley, numbered 975010. Later transferred to the BR Research Division at the Railway Technical Centre at Derby, for its last few years in traffic, it was repainted into original BR Green livery. Replaced by unit 901002.
• 79185 was taken into departmental use for brake trials, numbered 975012. It was scrapped in 1970.
• 79250 and 79252 were taken into departmental use as staff messrooms, numbered 975013 and 975014. They were scrapped in 1978 and 1982 respectively.
• 79649, the inspection saloon mentioned above, took its place in the departmental series as 999510.

File:Derby Lightweight Single Unit 79900.jpg

Thanks to their extended life in departmental service, one 2-car unit and a single car unit survive in preservation on the Ecclesbourne Valley Railway, the former following a high-profile campaign.

• British Rail BEMU – a power-trailer two car EMU based on the Derby Lightweight DMU design.

{{reflist}}

• {{cite magazine|title=The Derby Lightweight DMUs|first=Evan|last=Green-Hughes|magazine=Hornby Magazine|pages=88–91|issue=56|date=February 2012|location=Hersham|publisher=Ian Allan Publishing|issn=1753-2469|oclc=226087101}}

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{{British Rail DMU}}

Derby Lightweight

Category:Train-related introductions in 1954