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Southern Railway 4-COR, 4-BUF, 4-RES, 4-GRI British Rail Class 404
4-COR set 3101 passing Weybridge on 1 April 1958
In service	1937–1972
Manufacturer	SRLancing Works (underframes), Eastleigh Works (bodywork)
Constructed	1937-38
Formation	Power car + 2 trailer cars + power car
Operators	Southern Railway, British Railways
Specifications
Train length	265 ft 2 in (80.82 m)
Width	9 ft8+1⁄2 in (2.96 m)
Maximum speed	75 mph (121 km/h)
Weight	158 long tons 5 cwt (354,500 lb or 160.8 t)
Traction motors	FourMetropolitan Vickers[1]
Power output	4 x 225 hp (168 kW) total 900 hp (671 kW)
Electric system(s)	600 - 750VDCthird rail
Current collection	Contact shoe
UIC classification	Bo′2′+2′2′+2′2′+2′Bo′
Braking system(s)	Automatic Air
Coupling system	Screw-link
Multiple working	Standard SR system
Track gauge	4 ft 8+1⁄2 in (1,435 mm)standard gauge

TheSouthern Railway (SR) gave the designations4-COR,4-RES,4-BUF and4-GRI to the different types ofelectric multiple unit built to work the route between London Waterloo and Portsmouth Harbour. The 4-COR type units survived long enough inBritish Rail ownership to be allocatedTOPSClass 404. TheCOR designation had previously been used for the6-PUL units and was reused by them duringWorld War II when the Pullman car was stored, but this stock was different from the 4-COR units.

The SR electrified the London Waterloo to Portsmouth Harbour via Woking line in the mid-1930s, and full electric services commenced over the route from April 1937. For this service, 29 4-COR units (4-carCorridor units, numbered 3101–3129) and 19 4-RES units (4-carRestaurant units, numbered 3054–3072) were built.

Corridor connections were provided throughout each unit, including between units. This gave them a distinctive front-end appearance as the headcode display was placed on the opposite side of the gangway connection to the driving cab window, leading to their nickname ofNelsons (referring toLord Nelson's eyepatch, and also to their connection with Portsmouth).

It was intended that, for principal services, 12-car formations would operate with a 4-RES unit (providing the kitchen and dining facilities for the train) sandwiched by two 4-COR units. While all the other carriages for these units were built by the SR at itsEastleigh Works, the Trailer First carriages (which were laid out as dining cars) were built by theBirmingham Railway Carriage and Wagon Company (BRCW) and the Trailer Restaurant Kitchen Third carriages byMetropolitan Cammell.

The SR then electrified the line from Three Bridges to Portsmouth via Horsham and the coastal route from West Worthing to Havant, with services over this route commencing in July 1938. For services from London Victoria to Portsmouth via Dorking over these lines, another 26 4-COR units (numbered 3130–3155) were built, together with 13 4-BUF units (4-carBuffet units, numbered 3073–3085).

These new units followed the same design as the Phase 1 stock, except that the restaurant and kitchen facilities of the 4-RES units were replaced by the simpler provision of a buffet. All of these units were built by the SR at its Eastleigh works.

Initial formations of these units were as follows:

Due to the late delivery of the kitchen and dining carriages for the 4-RES units, these cars were not formed in the sets in numerical order, and some of the driving motor cars initially ran with other trailer cars as 4-COR formations.

The first changes took place duringWorld War II, following the destruction of 25 carriages during bombing raids. This total included the equivalent of three 4-RES units. A number of units were reformed to re-use the carriages that survived from individual units, and after the war was over new carriages were built to replace those destroyed, taking the numbers of the old ones. In total this involved eleven driving motor cars, seven Trailer Thirds, five Trailer Composites, and one buffet car and dining car apiece. This re-arrangement led to the loss of 4-RES units 3058, 3060 and 3063 and the formation of three new 4-COR units, which took numbers 3156–3158.

In 1955 4-RES unit 3072 was converted to a 4-BUF unit following a fire in the kitchen car, which was rebuilt as a prototype Restaurant Buffet design forBritish Rail. In 1961–1962 the kitchen cars in 4-RES units 3056, 3065 and 3068 were converted into Griddle cars. The units involved were given the classification4-GRI, and in 1964 they were renumbered 3086–3088.

In January 1964 the remaining 4-RES units were disbanded and the carriages reformed with former6-PUL and6-PAN stock. Between then and the final withdrawal of these carriages at the end of the 1960s a variety of different unit formations were created, including further4-COR units (numbers 3159–3166),6-COR (3041–3050),4-PUL (3054–3059),4-COR(N) (3065–3071) and6-TC (601). For further details of this complex period of unit reformations,see here.

• On 3 June 1960, an empty stock train formed by two units of the class overran signals atWaterloo and was in a sidelong collision with asteam-hauled passenger train that was departing forWeymouth,Dorset. A few passengers suffered slight injuries.^[2]

Apart from the 4-RES units, which were disbanded in 1964, the 4-COR, 4-BUF and 4-GRI types continued in existence through to the withdrawal of this stock from passenger service in 1972, covering various other services, such as the South Coast Services and the Waterloo - Reading Line, although the last planned working by 4-COR units on Waterloo to Portsmouth diagrams was on 31 July 1971.^[3] Thereafter the underframes of a number of carriages were reused by the engineering department as long welded rail carriers and crane runners. A full list of vehicles affected is below:

One complete unit was saved for preservation, as were a number of individual vehicles. The complete4-COR(N) 3142 was purchased by the Southern Electric Group for preservation by British Rail in 1972 and moved to the since defunct Steam Centre at Ashford (Kent).

In 1976 it was moved north to theNene Valley Railway and helped form the opening train in 1977. The unit came south again to Brighton in September 1986 for restoration work. The unit was moved again to St Leonards Engineering Depot in 1991 as better facilities aided restoration. By 2003 the unit had to be moved to theBluebell Railway, with S11187S going to theLondon Transport Museum at Acton.

Later on three of the unit's coaches were moved to theEast Kent Railway, with one coach remaining at Horsted Keynes station as an exhibit coach. In late 2012 S11187S was moved to join the three more coaches at the East Kent Railway. The unit has been operational as a two coach hauled unit since July 2013; the Southern Electric Group continues further restoration work on the unit to date.

In June, 2017, DMBTO 11201, TCK 11825 and TSK 10096 were moved to a site in Kent and sheeted.^[4][5][6]

Details are set out of surviving vehicles below:

Source

• Marsden, Colin J. (1983).Southern Electric Multiple-Units 1898–1948. Shepperton, Surrey: Ian Allan Limited. pp. 48–58.ISBN 0-7110-1253-9.

Wikimedia Commons has media related toBritish Rail Class 404.

• Southern Electric Group - Owners of Set no. 3142.
• Southern Electric Group - Details of class designation.

• Southern Railway (UK) electric multiple units
• British Rail electric multiple units
• Train-related introductions in 1937
• 600 V DC multiple units
• 750 V DC multiple units

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