A grade-separated rail interchange is known as a flying junction and one which is not a level junction.
With the massive increase of services and passengers since the Second World War, Stratford station has changed from being a fairly busy junction to one of the country's major rail interchanges.
Barnstaple used to be a major rail interchange, with three stations, but now there is just the one with its infrequent pootling services to Exeter, and a bus station overlooking the river.
The Free b service followed a circular route that travels anti-clockwise around the city centre linking major bus and rail interchanges.
The Ordsall Chord would preserve connectivity between the relocated East-West services and the city's existing main rail interchange at Manchester Piccadilly.
The station was closed in 2006 when it was replaced by Liverpool South Parkway, which is a combined bus and rail interchange.
In July 2009 plans were unveiled for a complete rebuild of the bus station to form part of a new bus and rail interchange.
As Rowlands Gill was not a rail interchange, it has to be assumed that they travelled the first part of their journey by means other than rail.
With the great increase in services and passengers since the Second World War, Stratford has changed from a fairly busy junction into one of Britain's major rail interchanges.
In December 2008, the town's new bus and rail interchange was opened at a site which used the existing railway station.