Class 458 4-JOP

The Class 458 4-JOP (Juniper Outer-suburban Porterbrook) was built for South West Trains in the late 1990s to replace some Class 411s, although for the Southern 750v DC third rail network they were "future proofed" with provision to support a pantograph and overhead electric collection though do not carry one yet [1]. Their entry into service as 458/0 was fraught with technical difficulties with serious usage on the Waterloo to Reading and Guildford-Ascot routes not happening for several years and after many modifications [2]. The unreliability saw SWT plump for the "Desiro" Class 444/450s instead of more 458s to replace the majority of its "slam door" EMU fleet [3].

Information
Number built: 30 4-car sets
(rebuilds) 36 5-car sets
Built: 1999-02
(rebuilds) 2013-6
Builder: Althom (Washwood Heath)
(rebuilds) Wabtec (Doncaster) & Brush Traction (Loughborough)
Engine: 6 Althom ONIX 800 traction motors
Power: 2, 172 hp (1, 620 kW)
Formation: (original) Driving Motor Composite Open (DMCO)+
Pantograph Standard Open (PSO)+Motor Standard Open (MSO)+DMCO
(rebuilds) Driving Motor Standard Open (DMSO)+PSO+MSO+TSO+DMSO

In 2011 after the withdrawal of the similar Class 460 from the Gatwick Express it was decided to use cars from the 460 to strengthen the 458s as 5 car trains (5-JOP). The trains were also refurbished and rebuilt with an improved appearance and full gangways. 5 "new" 458/5s (as they became known) were also created from spare rebuilt 460 cars. Work is still ongoing on conversions as well as repairs to a fire damaged unit [4] and should be complete sometime in 2016 [5].
SWT 458 535 at Clapham Junction

SWT 458 534 and friend at Clapham Junction

[1] "Class 458" Southern Electric Group <http://www.semgonline.com/gallery/class458_01.html>
[2] Colin J. Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013), p. 356
[3] "Train firm to replace new fleet", BBC News <http://news.bbc.co.uk/1/hi/england/london/3388679.stm>
[4] "Fire damaged 458 under repair", Railways Illustrated Issue 157 (March 2016)
[5] "458/5 programme nears completion", Today's Railways UK Issue 171 (March 2016)

Class 122 [Updated]

Twenty of these single car railcars were built in the late 1950s for branch lines in the Western, London Midland and Scottish Regions of British Rail [1]. Unlike the similar Class 121 railcars 9 unpowered driving trailers (originally classified as Class 150 [2]) were also built to supplement the single railcars, these could be hauled by the Class 122 in times of higher demand. Technically they are very similar to the Class 119 also built by the GRCW Company but with a BR Derby style high density layout [3].

Information
Number built: 29 (20 motor, 9 trailers)
Built: 1958
Builder: Gloucester Railway Carriage & Wagon Company
Engine: 2 BUT (AEC/Leyland) 6-cyl diesels
Power: 300 hp (220 kW)
Formation: Driving Motor Brake Second (DMBS)+Driving Trailer Second (DTS) [Optional]

They served until the mid-1990s in passenger service on lightly loaded routes such as the Stourbridge shuttle and the pre-electrified branch to Redditch [4].


In the privatisation era a number continued in departmental service as route learning and test cars for a number of years though all have been withdrawn from that role now. Eight have been preserved though none of the unpowered trailers have survived. Three Scottish Region Class 122s were converted to carry parcel traffic for a time and reclassified Class 131 [5].
M55006 at Wirksworth on the EVR

Another view of M55006 at Wirksworth

[1] Brian Haresnape, Diesel Multiple Units: The First Generation (Ian Allan, 1985) p. 54
[2] Class 122, Railcar.co.uk <http://railcar.co.uk/type/class-122/>
[3] Colin J. Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 81
[4] Gavin Morrison, British Railways DMUs in Colour (Ian Allan, 2010) p. 20
[5] Colin J. Marsden (ed.), "The Birth of the DMU", Modern Locomotives Illustrated No. 207 June-July 2014 (The First Generation Multiple Units), p. 19