You'd probably never see this Topiary unless it was pointed out to you, because when you walk by it looks like a normal hedge (head-on, that is). But from the side...
It jumps out! A freaking train, sitting right there on G Street!
Note as of December 1, 2004: the hedge seems to have been pretty much destroyed- there's not enough bushes left to form a train any more. Bummer.
Spring 2005 had the locomotive back and chugging along.