The brass water columns. I just bought one at the Chicago O scale meet, and might want to get another one but would like to chat with them first. I did a search and came up with an e-bay site that interestingly showed both the American Scale Models water columns in O and HO, as well as a bunch of Overland parts. So I went to the Overland site thinking maybe American Scale was a new division of that company, but found nothing.
Dave