Overview

The British Rail Class 168, marketed by its operator as the "Clubman", is a family of diesel multiple-unit (DMU) passenger trains used principally by Chiltern Railways. Introduced from 1997, the units were acquired to provide faster, more comfortable regional and intercity links between London and destinations in the English Midlands and surrounding areas. They are self-contained sets with underfloor diesel propulsion and multiple-unit control, allowing several sets to be driven together by a single driver.

Design and variants

The Class 168 family is composed of sub-classes that reflect two related design lineages. The earliest batch, allocated 168/0 under the national TOPS system, closely resembles the earlier Class 165 Networker Turbos in appearance and some electrical arrangements; this is a consequence of both types tracing their origins to plans developed for Network SouthEast (NSE). Later batches (commonly identified as 168/1 and 168/2) incorporate the newer-style driver cab and modular wiring and systems associated with the Turbostar family.

  • 168/0: early production batch with Networker-derived features.
  • 168/1 and 168/2: later builds with Turbostar-style cab and updated systems.

Formations and technical features

Units have been formed in various lengths, most commonly as three- and four-car sets, with flexibility to couple multiple sets for higher capacity workings. Mechanical design follows conventional DMU practice: underfloor diesel engines drive axles through gearboxes and final drives, and multiple-unit electrical and pneumatic systems allow units to work in multiple. Maximum operating speeds are suitable for regional express services (around 100 mph in regular service). Interiors are arranged for medium- to long-distance comfort and often include toilets, luggage space and a mix of seating classes where specified.

Construction and manufacturers

Construction of Class 168 units took place in batches from the late 1990s into the early 2000s. The later Turbostar-derived examples share a modular construction approach used across the family, which was produced by manufacturers associated with the Turbostar programme. These production methods assisted maintenance and parts commonality across contemporary fleets used by different operators.

Service history and operations

Chiltern introduced the Class 168s to modernise services on routes out of London Marylebone to the West Midlands, Oxfordshire and other destinations. The new units improved journey quality and timetable performance compared with older rolling stock and enabled operators to offer a clearer differentiation between regional express and suburban services. Over time, Class 168s have been used on both peak intercity services and less-demanding regional workings depending on timetable needs and fleet planning.

Refurbishment and upgrades

Throughout their service life many Class 168 units have received interior refurbishments and technical updates to extend operational life and to meet changing passenger expectations. Refurbishments have typically included seat re-trimming or replacement, updated lighting, passenger information systems and installation of modern passenger amenities such as Wi‑Fi on certain trains. Accessibility improvements to meet regulatory standards have also been undertaken where required.

Fleet management and maintenance

Fleet maintenance is carried out at dedicated depots and involves routine inspection of engines, transmissions, braking and safety systems. The modular nature of later batches has simplified some aspects of upkeep and allowed components to be standardized with other Turbostar family members. Operators manage formations and planning to match capacity with demand while maintaining reliability for intercity schedules.

Comparisons and legacy

The Class 168 sits in a lineage between the Networker-derived suburban DMUs and the modular Turbostar family, making it an illustrative example of late-20th-century evolution in British diesel multiple-unit design. It provided an intermediate step toward more standardized fleets and influenced subsequent procurement choices by operators seeking a balance of speed, comfort and maintainability.

For general definitions and technical context see materials on diesel multiple-units (DMU) and TOPS classification (TOPS). For operator information consult Chiltern Railways service pages (Chiltern Railways) and route summaries (London routes). Historical and manufacture notes can be found in overviews of the Networker programme (Networker) and the Turbostar family (Turbostar), while comparisons with related types are useful for context (Class 165). Construction dates and fleet introduction summaries are discussed in period summaries and fleet lists (dates of introduction), and classification details under national numbering schemes are documented in operational notes (TOPS).