1) My dad's Ives 1134 and Black Diamond cars (really, it all begins and ends with this)...
2) Tinplate trolleys and handcars (of any description)...
3) McCoy Great Northern freight set (just a beautiful train)...
4) Richart and Varney/Sirus standard gauge from the 1970's and 80's (too good to be true.)
5) Marx dump car and dump station (I agree!) Wham!
6) Hornby wind-up (they're soooo British)...
7) Bing turn-of-the-century stations (they just don't make things like that any more)...
8) Early detailed lithography - especially Ives - (and the American Flyer lightning bolt)...
9) Tinplate pedestrian overpasses (Marklin, Bing, Fandor, Hornby, Marx)...
10) Old small 4-wheel O Gauge tinplate cars of any make (as rattle-trap as it gets!)
11) Early, crank-or-lever-operated signals and accessories (the more ingenious and quirky, the better!)
12) Bridges! More Bridges!