British Rail Class 185

British Rail Class 185
Geof Sheppard · CC BY-SA 4.0 · source
Service	2006–present
Yearconstruction	2006–2007
Numberbuilt	51
Formation	3 cars per unit

British Rail Class 185

The Class 185 is a diesel multiple-unit passenger train introduced into revenue service in 2006 on intercity and regional routes in England and Wales. Designed for higher-speed regional services, the type entered service under the franchise awarded to FirstGroup subsidiary First TransPennine Express and later operated by TransPennine Express and Northern Trains, among others. The fleet was built to meet timetable and reliability commitments associated with the Railways Act 1993 franchising environment and the modernisation programmes following the Privatisation of British Rail.

Design and Construction

The Class 185 family was designed and manufactured by Siemens AG in partnership with Adtranz (later Bombardier Transportation) at works in Wolfsburg and Doncaster Works, with final assembly and commissioning overseen by Siemens Mobility. Specification work was driven by franchise requirements from FirstGroup and the then Strategic Rail Authority, seeking a three-car configuration to serve routes radiating from hubs such as Manchester Piccadilly, Leeds, York and Newcastle upon Tyne. The design drew on prior DMU development trends seen with Sprinter and Voyager families, incorporating a monocoque bodyshell, high-density seating for regional commuter flows, and on-board systems compliant with Rail Safety and Standards Board guidelines. Construction emphasised crashworthiness compliant with UIC and European Union Agency for Railways standards, while bogie and suspension choices targeted ride quality on the mixed-traffic routes connecting West Coast Main Line-linked corridors.

Technical Specifications

Each three-car unit is powered by three underfloor diesel engines driving hydraulic transmissions to provide a top speed of 100 mph (160 km/h), comparable to contemporaneous multiple-units such as the Class 220 and Class 221 Voyagers. The traction equipment includes Cummins engines coupled to Voith transmissions; bogies are of a design influenced by Siemens modular standards with primary and secondary suspension tuned for continental loading gauges used on TransPennine routes. On-board installations incorporate HVAC systems sized for British summer conditions, passenger information systems compatible with National Rail announcements, and crash energy management consistent with European crashworthiness protocols. Braking uses pneumatically actuated systems with blended dynamic features for wheel wear reduction, and unit formation allows multiple working compatible with TOPS classifications and depot maintenance regimes traced to Doncaster and Heaton servicing facilities.

Operations and Service History

Introduced in 2006, the type initially entered service under First TransPennine Express to replace older stock on intercity links between Manchester and Scotland as well as cross-Pennine services to Hull and Scarborough. Following franchise reorganisations, units were operated by successive franchise holders including TransPennine Express and operated alongside fleets such as Class 158 and Class 170 units. Deployments reflected timetable enhancements connected to infrastructure investment programmes at Network Rail, with route diagrams incorporating stops at Manchester Airport railway station, Bradford Interchange, Huddersfield, and Sheffield. The fleet has been based at depots including Newton Heath TMD and Heaton TMD, and has been involved in operational rostering changes driven by capacity demands for events at Old Trafford and transport shifts around Commonwealth Games planning in regional contexts.

Incidents and Accidents

During service the fleet has been involved in a number of incidents investigated by the Rail Accident Investigation Branch, with occurrences ranging from derailments attributable to infrastructure failures on routes managed by Network Rail to collisions during adverse weather conditions near Oxenholme Lake District railway station and other locations. Some incidents prompted safety recommendations to the Office of Rail and Road and operational changes by franchise holders, while others highlighted the interaction between rolling stock design and signalling systems such as TPWS and AWS. Investigations occasionally referenced maintenance regimes at depots overseen by operators and raised questions about extreme winter preparedness similar to incidents affecting other classes across the British railway network.

Refurbishments and Modifications

Throughout their service life, units have undergone interior refurbishments and systems upgrades driven by passenger feedback and franchise commitments managed by FirstGroup and later TransPennine Express management teams. Modifications have included seating reconfigurations, installation of improved passenger information displays interoperable with Real Time Information systems, retrofitting to improve accessibility under the Equality Act 2010 and Persons with Reduced Mobility Technical Specification for Interoperability requirements, and enhanced security systems complying with guidance from the Department for Transport. At times powertrain component replacements and software updates were carried out under contracts with suppliers such as Cummins and Siemens Mobility to improve fuel efficiency and reliability.

Fleet Numbers and Livery

Fifty-one units were built, each allocated a TOPS class number within the TOPS system used across British Rail-derived operations. Fleet numbering conventions were administered by rolling stock registries and operators; units have carried liveries reflecting franchise identities, including the original FirstGroup purple and white, later TransPennine Express branding with variations introduced for timetable publicity and corporate identity changes. Livery changes were often coordinated with interior refreshes and were used to promote route names servicing major stations like Manchester Victoria and Leeds City.

Preservation and Future Plans

Although relatively modern, some units have been considered for cascading to other operators or for withdrawal as electrification schemes on corridors such as sections of the TransPennine Route Upgrade reduce diesel demand. Preservation interest has been limited due to the units' recent construction and specialised systems, but some heritage organisations and private groups with links to Doncaster Works and regional preservation trusts have expressed conditional interest pending future disposal. Long-term plans hinge on franchise decisions, electrification progress overseen by Network Rail and government transport policy drivers linked to decarbonisation initiatives overseen by the Department for Transport.

Category:Diesel multiple units of Great Britain