Trains stand on mainline track close to junctions all of the time. Take Scarborough Station, for instance, or Pickering Station.Could it be an issue of a standing train on mainline track stationery so close to a junction? It looks like there is enough space between the end of the overpass and switch for a loco to stick out beyond the overpass and still have a line of sight to the signal bridge
In this specific case however, there seems to be a concern about stopped trains and the sightlines with the signals for the plant west of the station. And I'm not sure I understand why, as the distance from the end of the platform to the bridge is 150 feet - that should be more than enough to allay any concerns about signal visibility, and is certainly no worse than the two examples listed above.