I have been painting trains and interiors of houses for quite some time now,and I know there is a crackle laquer clear topcoat that can been applied to any finish.We did a kitchen one time(the cabinets and woodwork)in this finish.We then ran a brown wash over it,and the brown went into all of the cracks,and it looked fantastic.
As far as finishing the station goes,I know CHARLES WOOD sells TRAIN ENAMEL,and he definetly has the crackle black that went on one of the prewar engines&tenders!!!
I don't know if he makes that color for the station in a crackle finish,but he will mix you up what ever you need for a price$$$$. It stinks to the high heavens,and takes a long time to completely dry if you don't bake it,but Charlie Wood can hook you up. Check out his website. trainenamel.com -Kenny