Aynho Junction


 * }

Aynho Junction is a railway junction in Northamptonshire, England, a few miles south of Banbury. The junction is a flying junction, with the down line from Bicester North grade separated from the up and down lines from Oxford. The junction is the point where the Great Western Railway's New North Main Line of 1910 ends.

Train services
Today it is the point where Chiltern Railways' services to Birmingham Snow Hill join the same route used by First Great Western's services to Banbury and CrossCountry services between Reading and Birmingham New Street.

Signalling
Until the resignalling scheme in 1992, which transferred control to Banbury South signal box, the junction was controlled by Aynho Junction signal box. This was located between the down lines from Oxford and Bicester North. The signal box was decommissioned in 1992 and eventually demolished ten years later.

Planned upgrade
Despite the improvements that occurred with the re-doubling of the Aynho to Bicester section, there remain some concerns over the relative low speed limits on the Chiltern Line. During this re-signalling the up main line speeds were raised to 90 mph and a new control panel was fitted to Banbury South signal box. The existing layout is planned to be improved as part of the Chiltern Railways Evergreen 3 upgrade.