I bought Berlin -Leipzig from www.virtualtracks.net when the route was released.
Now i am about to buy Mighty Seddin Freight from Virtual Tracks but also noticed Railyard Seddin and wonder if someone knows if i need to buy both to get everything or if Railyard Seddin is somewhat "included" in Mighty Seddin Freight.
I see no information about it on the homepage, hence the question here! 
