Class 197

Class 197
Vanmanyo · CC BY 4.0 · source
Name	Class 197

Class 197

Class 197 is a diesel multiple-unit passenger train introduced in the late 20th century for regional and intercity services. Conceived to replace older rolling stock, it entered service after trials and regulatory approval, operating on multiple national networks and interacting with legacy depots, signaling authorities, and franchised operators. The type has been noted for its combination of modular construction, off-the-shelf components, and bespoke adaptations to meet route-specific requirements.

Design and Development

The design programme was initiated following commissioning by a coalition of transport authorities, including British Rail, Deutsche Bahn, SNCF, and regional administrations such as Transport for London and Transport for Wales. The industrial partners included manufacturers like Bombardier Transportation, Alstom, Siemens Mobility, and subcontractors in the supply chain such as ABB Group and Siemens. The project drew on earlier families exemplified by the Sprinter, Pacer, InterCity 125, and Pendolino concepts, while incorporating advances from the Javelin and Voyager programmes. Design reviews involved agencies including the Rail Safety and Standards Board and certification bodies such as the Office of Rail and Road.

Initial proposals considered alternatives promoted by the European Commission’s mobility directives and funding instruments including the Horizon 2020 framework. Styling and ergonomics were influenced by industrial designers who had previously worked on the Aventra and Desiro platforms. The development process emphasised crashworthiness standards set after incidents like the Hatfield rail crash and the Potters Bar rail crash, and incorporated accessibility requirements aligned with the Disability Discrimination Act and the Equality Act 2010.

Technical Specifications

The units feature a modular bodyshell with crash elements compliant with standards used by Network Rail and international counterparts such as UIC norms. The traction system utilises diesel engines supplied by manufacturers including Cummins, MTU Friedrichshafen, or MAN depending on subfleet, coupled to hydraulic transmission components from Voith or electric alternators from Siemens. Braking systems integrate electropneumatic brakes and regenerative capability compatible with Automatic Warning System and Train Protection & Warning System equipment.

Onboard systems include passenger information units derived from systems used by Virgin Trains and Great Western Railway, HVAC units similar to those on TransPennine Express units, and passenger seating arrangements that echo layouts from East Midlands Railway and ScotRail. The bogies and suspension are evolutions of designs used by Bombardier Voyager bogies and Siemens Desiro suspension, optimised for route profiles such as the West Coast Main Line and regional branch lines. Safety and control interfaces support compatibility with European Train Control System and national variants.

Service Operations

Class 197 units entered revenue service on regional corridors and inter-regional expresses, rostered on routes once served by units from FirstGroup, KeolisAmey, Arriva, and Stagecoach franchises. Timetabling involved coordination with infrastructure managers like Network Rail and international operators such as SNCB for cross-border services. Crewing and training referenced practices from ASLEF and RMT agreements, and depot allocations were negotiated with unions and operators including MTR Corporation and Abellio.

The fleet saw deployment on corridors linking cities such as Manchester, Birmingham, Leeds, Edinburgh, Cardiff, and Bristol, with some formations scheduled for airport links servicing hubs like Heathrow and Gatwick. Operational constraints required interface adaptations for level crossings governed by historical incidents at locations like Salisbury and signalling upgrades prompted by projects akin to the Digital Railway initiative.

Fleet and Production

Production contracts were awarded following competitive tendering involving consortia with firms like Hitachi Rail, CAF, Stadler Rail, and Nippon Sharyo. Assembly took place across multiple plants, referencing previous manufacturing bases such as Derby Litchurch Lane Works, Wien Simmering and Krefeld. Subfleet variants were distinguished by engine type, seating density, and on-board systems, comparable to how Class 800 and Class 222 families contain sub-classes. Numbering and fleet lists were maintained by national registries and published by bodies including the Railway Gazette and Heritage Railway publications.

Lifecycle plans factored in mid-life refurbishment cycles similar to programmes undertaken by Transport for Wales Rail Services and Northern Trains, and spare parts logistics were coordinated through suppliers with distribution networks like DB Schenker Logistics and DHL Supply Chain.

Incidents and Modifications

During its operational history, Class 197 experienced a small number of incidents that led to investigations by authorities such as the Rail Accident Investigation Branch and regulatory reviews by the Office of Rail and Road. Outcomes prompted retrofits analogous to modifications made after the Soham rail disaster and safety measures introduced after the Potters Bar rail crash, including strengthened cab structures and revised fire suppression arrangements following guidance from the Department for Transport.

Modifications over time included software updates for signalling interoperability with ERTMS deployments, interior refurbishments following passenger surveys conducted by Transport Focus, and mechanical upgrades coordinated with suppliers like Alstom and Siemens Mobility. Some sets were adapted for alternative duties, borrowing conversion concepts used in the refurbishment of Class 319 units and the transformation programmes for Class 150 series.

Category:Diesel multiple units