Chiltern Railways operates commuter/regional rail passenger services from its Central London terminus at London Marylebone along the M40 corridor to destinations in Buckinghamshire, Oxfordshire and Warwickshire, as well as long-distance services to the West Midlands along two routes. Services on the Chiltern Main Line run from London Marylebone to Birmingham Snow Hill, Stratford-upon-Avon and Oxford, with some peak-hour services to Kidderminster.
Chiltern Railways also runs trains on the London to Aylesbury Line to Aylesbury (with some trains terminating at Aylesbury Vale Parkway instead), on the Princes Risborough to Aylesbury and Oxford to Bicester branch lines.
Chiltern Railways is part of the Arriva group, one of the leading providers of passenger transport in Europe. Arriva employs more than 60,000 people and delivers over 2 billion passenger journeys across 14 European countries each year. Arriva is committed to providing innovative and customer focused transport solutions that are built around the needs of passengers, transport bodies and tendering authorities. Arriva runs a range of transport services including trains, buses, trams, coaches, waterbuses and non-emergency passenger transport. It is part of Deutsche Bahn (DB) and is responsible for DB's regional passenger transport services outside Germany.