Right you are. In fact, I have one made by Rapido that came with my Postage Stamp Train set from back in the early 70s. I basically pick up any crummies in B&O, though, including one like Tim has. Cost me $25 at the GSTS in Timonium. Tried to talk the fellow down, but he kept saying "they don't make them anymore...".
Just heard from JNJ, caboose kits are ready to ship. Last chance to put your name in the hat if you want me to beef up the order for you. We are ordering a dozen as is and 5 are spoken for right now.
Just a note, the JNJ B&O Wagontop kits arrived at the shop today. There are some left, if anybody is interested, PM me.