It is short
(yet crosses a fare boundary, as attendees of our Fares Workshops will know ) but nowhere near as short as previous examples.
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Define the question precisely, then I'll answer.
For example, is it simply a case of a National Rail train service, or do you mean Network Rail owned tracks? There is a huge difference between them, as National Rail services operate on track owned and/or maintained by other organisations such as London Underground, and an example of the inverse of that would be the Tyne & Wear Metro operating on Network Rail metals.
But it's also unclear how to actually measure the distance. Do you take the distance on foot, between the closest entrances? Or the distance between platforms, or the distance trains actually travel? Some of them are going to be so close that we cannot possibly reach a conclusion without knowing which definition to use
It keeps cropping up, e.g. in
2009 (though the "on the same line" clause caused confusion), also in
2011, and more! Plus several related themes such as
Stations that are too close together.