Quite happily, I've been looking at doing N gauge models. I really like the scale, which works out at roughly half OO/HO. One range of items that caught me, unsurprisingly, is the Tomix range.
Sold in Japan, there are multiple locomotives, coaches, wagons and buildings you can buy. Whilst the buildings aren't anything special, the rolling stock is amazing.
So far, I have a Henry and a Percy. I'm aiming to get the other two in the range, Thomas and James, then complete the gaps by making my own locomotives. It'll take time but it'll look decent.
Jack