Chiltern Railways is the train provider operating the Chiltern Railways line along the M40 corridor, including the Chiltern Main Line, since 1997. The company is owned by Arriva UK Trains, after M40 Trains (which originally won the bid to operate the franchise for 20 years in 2000) was sold to Deutsche Bahn in 2008. Here the company became a part of the DB Regio group, which later became a subsidiary of Arriva UK Trains.
Chiltern Railways runs services on five lines which include the Midland Main Line, London to Aylesbury Line, Leamington to Stratford Line, Princes Risborough to Aylesbury Line, and Oxford to Bicester Line. The services call at over 60 stations, and Chiltern Railways operates 32 of these stations. Chiltern is continuously considered one of the best train operators in the UK, with a Public Performance Measure routinely above 90%. Investment into the updating and maintaining of the franchise infrastructure has taken place in the form of of project Evergreen. This project, executed in phases over 20 years will see track and signal improvements, as well as the laying of new tracks to create a new Oxford to London Marylebone service to operate.
The main terminus station for Chiltern Railways is the iconic Marylebone Station in London. Other important stations include Amersham, High Wycombe, Stratford-upon-Avon, Leamington Spa, Banbury, Warwick Parkway, Birmingham Snow Hill, Birmingham Moor Street, and Kidderminster. Some of the core journeys operated by Chiltern Railways are the half-hourly services from London Marylebone to Aylesbury, and hourly services from London Marylebone to Princes Risborough, London Marylebone to Gerrards Cross, and London to Birmingham.
Like most train services in the UK, Chiltern Railways tickets can be purchased as Advanced tickets on specific trains for a better value, or as Anytime tickets for more flexible journeys. Tickets can also be purchased for Off-Peak times to save money, as fares during commuter Peak Times usually cost more. A First Class is not offered by Chiltern Railways, however on select Peak Birmingham to London services a premium Business Zone is available. Tickets can be purchased with Railcard discounts on the Chiltern Railways, and passengers who do so must always carry their Railcard with them on journeys.