UTA 70 Class

Ulster Transport Authority 70 Class
A Class 70 set stands at Belfast York Road station
In service	1966–1986
Manufacturer	UTA York Road
Number built	8 power cars, 18 trailers
Formation	3 cars per set
Fleet numbers	Power cars: 71–78
Capacity	248 (6-car set)
Operator(s)	Ulster Transport Authority Northern Ireland Railways
Specifications
Train length	379 feet (116 m) (6-car set)
Maximum speed	70 mph (113 km/h)
Weight	245 tons (6-car set)
Prime mover(s)	English Electric 4SRKT
Power output	550 hp (410 kW)
Track gauge	1,600 mm (5 ft 3 in)

UTA 70 class was a diesel multiple unit train built for service on Northern Ireland Railways. The MED’s and MPD’s, which made use of readily available power and transmission units, were cheap to operate but noisier and not as comfortable as locomotive-hauled rolling stock, a fact which made them unsuitable for Inter-City journeys. The decision was made to develop a new generation of multiple unit and in July 1966 the first of the new DEMU sets entered service.

Investment was needed on the “Inter City” routes and it was a straight choice between new locomotives and coaching stock or a new generation of multiple unit. The decision was made in favour of new multiple units and in 1966 the first of these entered service, designated 70 Class.

Unlike the MEDs and MPDs with their low - powered underfloor engines and mechanical transmissions spread through the train, the new units had a single English Electric engine of 550 horsepower (410 kW), fitted in a compartment between the driving cab and the passenger saloon, and electric transmission. Whilst construction was carried out at the UTA's York Road works in Belfast they imported underframes and body parts. This order comprised parts for the construction of eight power cars and the modification of existing coaches, The 70 Class were first introduced on the former Northern Counties Committee section but were later also worked cross-border trains.

Like the MPDs these units were also suitable for working freight services and regularly appeared on the CIÉ freight services to and from Londonderry.

The 70s were numbered as follows:

The original trailer cars were as follows:

In 1968–1969 more trailers were added.

The power cars' interiors were rebuilt between 1976 and 1979. During the same period 711 to 714 and 726 were rebuilt from side corridor to open layout.

Trailer 728 (brake Standard) was rebuilt in 1976 from MPD driving trailer 534

In 1977 701 and 703 were rebuilt as Driving Brake Standard open.

It was decided in 1983 that the 70 Class railcars would be replaced, No. 78 had already been withdrawn in 1978 after just 10 years of service after being bombed by the IRA. No. 76 was withdrawn in 1984 and the remaining units followed in 1985–1986. The last set in service was a five-car set operated by power cars no. 75 and 77. Both were withdrawn on 1 April 1986. For the new units, and after heavy refurbishment, engines, generators and traction motors were recovered as the 70s were withdrawn for re-use in the new 450 class. After withdrawal, it was discovered that the power cars contained blue asbestos, so they were sent to Crosshill quarry, Crumlin, along with other NIR stock and even some CIÉ stock for disposal. They were put into a flooded part of the quarry, since water dampens asbestos, meaning that no loose fibers could escape from their structures. Most of the under frames were kept for use as flatbeds.