File:Longbridge Station - Geograph.org.uk - 1601412.jpg
Looking at north platform from road, Longbridge station began services without any buildings. Longbridge was also the southern termination of the service at the time, extension to Redditch did not come until later. A 'siding' further south was used to hold trains awaiting next service north, so as not to block routes in either direction - there were other express services that did not always use the middle tracks.
Notice the double set of DMUs awaiting to depart from north platform - sets were often of mixed origin, and due to poor maintenance and age, often 'failed' at inconvenient points on the route, particularly approaching New Street, and would often require railway staff to 'uncouple' manually failed sections.
Ahhhh, passengers had much more fun in those days.....(required by the license)