Matt -
The pilot (cowcatcher,) smokestack, and air tank are "spare" parts from Accucraft, the tender trucks I picked up on eBay, the headlamp and other boiler details like clean-out ports, steps, etc. are from Ozark Miniatures, Trackside Details and my junk drawer. The coal bunker on the tender I built up with strip and sheet styrene. Hope that helps.
P.S. Did I mention that this is a 1:20.3 scale model (large scale) - not 1:48 (On30)?