Do yourself a favor and check out Brooklyn Locomotive Works (BLW) on the net. They have a terrific selection of locos and freight cars with color pictures and their delivery is very fast coming priority USPS.
I recently bought two new Kato NW2 switchers and these are perfect with new slow speed capability. Museum quality.
Beware of lower volume retail dealers that might have a stock of older machines of all kinds. They obviously don't throw out obsolete stuff.
BLW is a good old Nscale shop.
I like 4Nscale.com. in GA
For Kato Unitrak, check out ToyTrainHeaven.com in PA.
:)
Yeh, but BLW has great pictures of everything, And Pete is kind enough to answers questions.