AMCDave posted:OK.....after talking about the Turbine here decided to go down and run it tonight. I was moving it from a table to the layout and a 2 inch long phillips head machine screw came out from the front truck area. I took it to the work bench, removed the front truck and saw a hole and attempted to put this screw into it. It goes in....but catches on nothing just spins. I check as much as I could and then put it on the layout...runs fine....well like it always has. Any idea what this long thin machine screw is holding?? I really do not want to tear it down and not figure out what it is/was for....Thanks
If it helps you figure it out, the exploded diagram for this engine seems to be in Lionel Service Supplement # 21, pages 8-11 (tender is a few pages later).
I took a quick look, the only thing that looks like it might be of that length is a part they called the "Weight Mounting Screws" on page 10. They have no part number listed and showed as not available on the diagram itself.
Is there another similar hole to the one you found that does have a screw? The diagram shows 2 of these. Obviously don't remove the second one! 
-Dave
