It's a new remote which will control all the cab effects in the new legacy steamers. Everything from crew talk, swinging bell, quillable whistle, etc. The only bad thing is it is the only way to control the latest feature additions to be announced in the next catalogue and will set users back $299 though I imagine the street price will be more around $249.
--Greg
P.S. I have no idea what it is..just having some fun.