> What I was referring to in the previous note is the fact that the four-wheel > pony truck is mounted on a bolster, like a freight car truck. A two-wheel > truck has a triangular swing frame, with the mounting point (pivot point) > under the firebox. The mounting bar is held under the firebox by a couple > of arms that reach down from the frame (see pic). Hi Vance, I believe you will find that "technically" a four wheeled "truck" isn't a "pony" truck, as the definition of "Pony truck" is a two wheeled truck. The photo you show is most definitely a pont truck, as it has but two wheels, but a four wheel truck is either a leading or trailing truck, not a "Pony" You can find this doccumented at: http://www.dictionary.net/pony+truck Dictionary.net and in several texts. Keith
