I've put together some rolling stock based on the Durango and Silverton Narrow Gauge railroad in Colorado.
I've got 6 cars in yellow built, plus a brown box car and an car in red (bright red rather than the prototypical dark red/reddish brown). Here's a shot of three of them. Clicking it will take you to flickr with individual shots of the cars.
They're lettered, although the match with bright yellow isn't great and the text could stand to be twice as big.
I've got a Emerald Night in Black and grey as a stand in for the K-38 Mikados they run, that's this year's project to build, along with some larger scenery. You can see some test pieces the cars are sitting on.