On Relay Interlockings data logging has generally been installed but potentially at Ore being a modified mechanical box (Hastings i believe) it might not be installed. Note data logging comes built in with modern electronic signalling.
Correct. That is why the signals on the diagram are prefixed EDL, the old Southern colour light prefix code for the box. Hastings has a large mechanical lever frame that at one time presumably controlled a much more complex layout at Hastings station. The Ore area was added to the Hastings frame using levers that would otherwise have become spare when the station layout was simplified. The basic interlocking is accomplished mechanically, with the results transmitted via multicore cabling to the electric point machines and colour light signals in the Ore station area. It is perfectly feasible theoretically to connect up a multichannel data logger to the primary relays of such a setup, just as in a wholly relay-based interlocking, but I have no idea whether that is the case here. One practical problem in doing that is if shelf type relays are employed, there are sometimes no spare contacts available, as ideally you use voltage free contacts for the logger. The older shelf types usually only have 2 changeover and two front contacts whereas plug-in miniatures (930 series) have up to 16 contacts variously arranged. Making up repeat relays just to allow logging involves more complex design and can defeat the object if you're introducing more complexity and no longer monitoring the primary functions.
