Tomorrow night, 10 PM(Eastern) on BBC America.(CH 264 on Direct TV)

James May's Toy Stories He makes the world's(So he claims) the longest model railroad track.
This is a pretty cool show. I've watched a couple episodes.(Lego House, running slot cars along the old Bristol England Speedway(3 and some miles long) and Merccano Bridge). I highly recomend it.
You folks across the "Big Pond" have probably already seen it.

Thanks Ed, I now have it on my DVR. I can record it at midnight (it's on several times during the week) and watch it anytime I want. Some of the other episodes look interesting as well even though they're not about trains, they are about modeling.