Here's more than you probably ever wanted to know about the version I have...
Main Station Litho - 9 15/16" long
Base Length - 10 5/8" long
Roof Length - 10 5/16" long
Height - roof top to base bottom - 3 3/8"
Use for O gauge - it's pretty small but then O tinplate is all over the map when it comes to sizes
However, there will be problems ...
Your O scale people are going to get headaches smacking their heads on the door frames and it looks like they will have to get down on their hands and knees in order to go inside to purchase a ticket/collect their baggage ...
...and getting on and off of the passenger cars might be a problem - presumably the station agent has movable stair cases like the airlines 
