Chiltern Railways

Company History: Chiltern Railways is a British train operating company owned by Arriva UK Trains, that has operated the Chiltern Railways franchise since July 1996. It 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 to Birmingham Snow Hill, Stratford-upon-Avon and Oxford, with some peak-hour services extended to Kidderminster.
Chiltern Railways also runs trains on the London–Aylesbury line to Aylesbury (some of which continue on to Aylesbury Vale Parkway), and on the Princes Risborough to Aylesbury and Oxford to Bicester branch lines.From Wikipedia

Successor/Parent History: Arriva is a multinational public transport company headquartered in Sunderland, England. It was established in 1938 as T Cowie and through a number of mergers and acquisitions was rebranded Arriva in 1997 and became a subsidiary of Deutsche Bahn in 2010. Arriva operates bus, coach, train, tram and waterbus services in 14 countries across Europe. As of September 2018, it employed 61,845 people and operated 2.4 billion passenger journeys annually. It operates as three divisions: UK Bus, UK Rail and Mainland Europe.

Brief History: The United Kingdom, made up of England, Scotland, Wales and Northern Ireland, is an island nation in northwestern Europe. England – birthplace of Shakespeare and The Beatles – is home to the capital, London, a globally influential centre of finance and culture. England is also site of Neolithic Stonehenge, Bath’s Roman spa and centuries-old universities at Oxford and Cambridge.