Transcript of Locomotive Engineers And Firemen: 
by Charles A Hoxie, 1876
Page 30


 What is technically termed "tramming" consists in so adjusting the driving wheels that they shall stand square with the frame of the engine. It is generally done when repairs are being made in the shop, but it is important that every Engineer should be familiar with the expeditious mode of doing it. When the driving wheels are taken from under the engine, the distances are equalized both ways from the face of the blind wedge of the forward main box to the male casting which is fastened to the smoke box, between the cylinders, and in the center of the boiler. After the blind wedges to the forward driving boxes are trammed, all the driving boxes being ready, they are place in the pedestal or jaws of the main boxes, and the center of the boxes being obtained, the back wedges may be adjusted by tramming from the center of the forward driving box to the center of the back driving box, thus equalizing the distance of both main centers on both sides of the engine.

Page 31

Much trouble is often avoided by having an engine properly center-marked. This is done as follows: After the blind wedges to the forward boxes have been trammed and put in place, then tram from the face of the blind wedge of the forward driving box to the outside of the pedestal or jaw to which the blind wedge is fastened. Tram as far back from the face of the wedge as possible, and make a prick punch mark on the pedestal, using the same tram for both sides of the engine, taking care that the distances from the face of the wedges to the marks on the jaws are alike on both sides. Tram from the middle of the jaws. When engines get out of tram, as they do frequently, the center marks may be used to adjust the machine without raising it off the driving wheels. The forward driving wheels should be trammed first from the center marks and then made to serve as a guide for the rear drivers. Particular attention to this matter is essential to secure the easy working of the locomotive and the avoidance of hot crank-pins and similar drawbacks.

Chapter 1 - Introduction 
Chapter 2 - Locomotive 
Chapter 3 - The Fireman
Chapter 4 - Advice to Young Engineers
Chapter 5 - Tramming and Center Marking
Chapter 6 - Adjusting Side and Main Rods
Chapter 7 - Pumps and Pump Valves
Chapter 8 - Cylinder and Cylinder Packing.

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