Re: D&RGW 1500 Gon Mortice and Tennon Deisgn

According to the drawings, the side sills have two tennions which go 2 1/2 inches into the 6 inch thick end sills, they also have an 6 inch ear which sticks out below the endsill that has a 5/8 inch hole centered vertical. The endsill has a vertical coresponding hole. the bolt that fastens these together does not go through the tennions as it just clears the shorter tennions.
It's a lot clearer in the drawings than in this description. I believe that Bruce Maxwell offers prints from a tracing of one of the Gon erecting drawings that his father made.
Thanks to the late Jack Thode and the D&RGW, the Original D&RG pen and ink erection drawings for most of these cars are now in the DPL western history collection. At one time it was possible to purchase blueline copies from them.
Dave G