Exeter West signal box 'Dog Chart' track layout diagram at dusk (wide angle fisheye lens view)
Exeter West signal box is not at Exeter - it is at Crewe.
Why is this? Because a group of dedicated individuals saved the signalbox from demolition when the signalling in the Exeter area was renewed in 1985, and carefully dismantled it so it could be re-erected as a working museum demonstrating how the larger signal boxes of the past were.
This box is now viewable at Crewe as part of Crewe Heritage Centre display, and "signalmen" are present most weekends to describe and demonstrate signalling days of the past and answer questions from visitors.