In planning my GWR Branch line (40s era) I want to incorporate some form of Dairy and a reason to run 6 wheel Dairy Tanks.  I have tried researching the topic, but have not turned up much on the subject.   Can anyone point me in the right direction?  I'm trying to figure out what kind of building I will need size wise, etc.  I am familiar with the haulage of the Tanks, and that one weighed as much as a fully loaded coach.  I am also aware that one tank could provide a day's milk to 35,000 peop