Hi Larry,
I think that photo C is the right option for the goods shed, with the signal box on the platform.
One thing that bothers me is the location of the coal bins - they are on the wrong side of the access road and should be adjacent to the track in order that the wagon can be off-loaded straight into the bins, the present arrangement means that there would be double handling of the coal to get it into the bin and also means that the coal has to be moved across the access road, If the goods shed is moved to photo C position, then the weighbridge and office could be located in the area vacated by the goods shed and be adjacent to the entrance to the coal yard.
Just my thoughts.
kind regards
Mike