Class 142

Class 142
Name	Class 142
Powertype	Diesel multiple unit
Caption	A typical unit in original livery
Builder	British Rail Engineering Limited; Leyland Motors
Builddate	1985–1987
Numberbuilt	159
Formation	2-car sets
Operator	British Rail; FirstGroup; Arriva; Northern Trains; TransPennine Express
Maxspeed	75 mph (121 km/h)
Engine	Leyland Motors TL11 diesel
Transmission	Mechanical

Class 142 is a class of 2-car diesel multiple units introduced in mid-1980s United Kingdom regional passenger service. Conceived during a period of fleet renewal under British Rail programme initiatives, these units were produced to replace ageing BR First Generation DMUs and rural stock on branch lines and commuter routes. Controversial for ride quality and passenger comfort, they nonetheless served extensively across networks including the Northern England and Scotland regions.

Introduction

The Class 142 was part of a wider strategy following the TOPS renumbering and fleet modernisation driven by HM Government transport policy in the 1980s. Developed alongside contemporaries such as the Class 150 and Class 155, the design reflected cost-driven choices influenced by suppliers including British Leyland and BREL works at Workington and Crewe Works. Units entered service amid shifting priorities from industrial policy debates and network rationalisations exemplified by the legacy of the Beeching cuts.

Design and Technical Specifications

The structural design borrowed extensively from the Leyland National bus manufacturing techniques and integrated components from AEC and Cummins-based subsystems. Each 2-car set used a mechanical transmission system paired with Leyland TL11 diesel engines producing modest horsepower suitable for short regional runs. Bogie design used economical axleboxes derived from light rail practice and the braking systems followed standards influenced by Railway Clearing House-era protocols. Passenger accommodation incorporated longitudinal seating similar to urban London Transport layouts, with minimal insulation compared to InterCity 125 sets. Electrical systems were compatible with depot equipment at locations such as Crewe and Heaton.

Production and Deployment

Manufacture of 159 two-car sets was completed between 1985 and 1987 by a consortium including British Rail Engineering Limited and industrial partners connected to the British Leyland group. Initial allocations targeted regional operators in Northern England and Scotland, with traffic planning coordinated by regional management offices formerly part of British Rail Regional Railways. Deployment saw units assigned to depots at Hull, Leeds, Newcastle upon Tyne, Glasgow Queen Street, and Carlisle, operating alongside units from Class 150 and Class 156 fleets on commuter and branch services.

Service History

Throughout service life, Class 142 units worked suburban and rural services on routes including the Tyne Valley Line, Huddersfield Line, and parts of the TransPennine network. Their operational profile overlapped with franchise holders such as Northern Rail and later Arriva Rail North and Serco-Abellio under the Department for Transport franchise system. Performance criticisms—raised by campaign groups like Railfuture and addressed in parliamentary questions by MPs representing constituencies on affected routes—focused on ride quality, accessibility standards under the Disability Discrimination Act 1995, and durability compared with Sprinter family units. Refurbishment programmes in the 2000s by private contractors updated interiors, CCTV, and passenger information systems to meet evolving safety requirements overseen by the Office of Rail and Road.

Accidents and Incidents

Class 142 units were involved in a number of operational incidents ranging from minor derailments to more notable collisions investigated by the Rail Accident Investigation Branch and predecessor agencies. High-profile events prompted roll-call reviews of maintenance practices at depots such as Thornaby and Heaton and led to safety advisories issued by the Health and Safety Executive in coordination with Network Rail infrastructure assessments. Investigations examined contributing factors including track condition on branch lines, coupling reliability, and human factors under regulations influenced by the Railways Act 1993.

Preservation and Legacy

With the advent of accessibility regulations and the introduction of newer rolling stock like Class 150 and Class 331, many units were withdrawn from frontline service in the 2010s and early 2020s. Several sets found second lives with heritage railways including the North Yorkshire Moors Railway, East Lancashire Railway, and preservation groups such as the Mid-Norfolk Railway Preservation Trust. The class remains a subject of study in transport history collections at institutions like the National Railway Museum and has been documented in works by authors associated with Ian Allan Publishing and Platform 5 Publishing. Debates about their legacy continue in policy forums hosted by Campaign for Better Transport and academic studies at universities including University of York and University of Huddersfield.

Category:Diesel multiple units of the United Kingdom