I have a signalling query for a layout I am constructing.
Consider a terminal station built by one company (LSWR for example). Some years later another company (say GWR) builds another line to the same town and, due to lack of space, effectively adds to the original station by building another platform for their use, with cross-overs allowing travel to the LSWR and vice versa.
Does the GWR add it's own signal box controlling it's own platform and cross-overs or does the LSWR signal box cover the whole area, GWR taking control outside the station.
Have tried looking at examples, but nothing is clear. For example, these two shared a station at Salisbury, but effectively these were two different stations, not even sharing an approach road or station building. The best I can find is Bath Green Park, but I cannot find out signal box limits for this station (Midland / SDR).
Any help would be of use!!