British Rail Class 126

The cars were of steel construction and featured Pullman gangways and buckeye couplings.[1] Each power car was fitted with two AEC 150 hp underfloor engines with mechanical transmission giving a maximum speed of 70 mph. Initially termed "Inter-urban", this was soon changed to "Inter-City" long before that branding was used for mainline express services.

These trains had two front-end designs: either a full-width cab or a half-cab with central gangway connection. The latter "intermediate" driving car allowed through access within a six-car set.[1] Neither end featured any destination blinds or marker lights, only a box holding a stencil indicating the train classification (A, B or C; later changed to 1, 2 or 3).[1] Power car seating was of the "open" saloon arrangement with compartment seating in the trailers. A unique multiple working control system (coded White Circle) was employed. Unlike other classes, each power car produced its own control air supply and was thus incompatible with any other.

The second batch was closely based on the 1956 stock. One big improvement was that the guard's van was moved to the rear of the coach giving passengers a forward view. Four-character headcode displays were fitted; the intermediate power cars having a two-character box either side of the gangway. Destination blinds and marker lights were not incorporated.

The first series (79xxx numbered) were introduced to Glasgow Queen St to Edinburgh Waverley services, including those operating via Falkirk Grahamston, in January 1957; the units were allocated to Leith Central depot following its conversion from the closed railway station in 1956. However, the first six three-car sets worked their first three years on Western Region on Birmingham–South Wales services. There was criticism of the lack of a forward view for passengers and also of the plain "utility" appearance of the non-gangwayed cab front. The usual E. & G. formation was a six-car set with two trailers together in the centre of the train. The class usually stuck to this route but could appear on other services from time to time.

The second series (5xxxx numbered) were introduced on Ayrshire Coast services in August 1959 working services to Ayr and points south including Girvan and Stranraer and coastal services to Largs and Ardrossan. These units were allocated to Ayr and were operated as 3-car half sets combining to form a full 6-car trainset; the outer ends had full width windows whilst the inner ends had gangways with side windows and a side cab driving position.

The 1970s saw the first class accommodation downgraded. Being of a non-standard design, the class was not included in the DMU refurbishment programme and so remained in close-to-original condition. The main alteration was the plating over of the outer gangway connection on the DMS vehicles in 1979–81, following drivers' complaints of draughts.

The original units (79xxx series) on the Edinburgh - Glasgow services were displaced by push-pull services powered by top 'n tail Class 27s in 1971 and all were withdrawn by 1972, except for four cars transferred to Ayr. The Ayrshire Coast stock fared rather better, surviving almost intact until mass withdrawals in the early 1980s, the last two units being withdrawn in January 1983. Although used on various other routes out of Glasgow in their final years, these 126s remained closely identified with the Ayr line until displacement by a mixture of loco-hauled trains and other DMUs. Electrification meant that DMU operations on the Ayrshire routes finally ended in 1986 with the introduction of Class 318 EMUs.

Five of the ex-E&G leading power cars were overhauled and exported to Liberia for use by LAMCO mining company for staff trains.[2]

Four vehicles (51017, 51043, 59404 & 79443) survive in preservation, owned by the Scottish Railway Preservation Society and based at the Bo'ness & Kinneil Railway. Three of these vehicles have been completely overhauled and are currently in Apple Green livery and the buffet car (79443) is currently undergoing restoration. They most recently featured at the 2018 Winter Diesel Gala. Three others (59098, 59099 & 79441) went to heritage lines but have now been cut up for spares.

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