Cass 6 Truck Part
The individual parts of the Heisler trucks are difficult to photograph because they are hidden by other parts of the locomotive as well as the gears inside the truck. Without the good fortune of finding the middle truck off the locomotive and partially disassembled on a photo trips in June and July, 2004 I doubt if I would have ever figured out the shape of some of the castings. The trucks are complex so I've split the description into two parts to keep the download time reasonable while presenting many photos. The sides and bolster are discussed in this first part with the remainder of the components presented in Part II. The wheels, rods, gears and brakes are described elsewhere.
The drawing above accurately describes the outer surface of the truck side. The inner surface has considerable variation with lips, cavities and webs and no attempt was made to capture these inner side details on the drawing.
The drawing above shows the truck bolster. No attempt was made to show the interior cavities. I've shown more dimensions that usual on this piece to assure myself that the pieces fit together. For example, the bolster must fit with the sides, the caps and also match up with the frame bolster. And, the bolster must position the frame at the correct height.
This is a good point to break. The truck is finished in Part II