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Well, after a 35 month wait, the Big Boy I ordered through my local hobby shop arrived, along with the other 2 the shop ordered for counter sales, and they both were sold the next day.  My layout is an 11 X 14 around the room double track with crossovers, and I had plans to install the MTH double track arch bridge across the window on one of the 11 ft ends,  I also had the short double track girder bridges I planned to use for the approaches.  I got info on things like track spacing to the walls on curves, but the one thing that was missing was the loco  overhang coming out of the 72 inch curves into the bridge.  Well, turns out the front of the loco will clear the sides of the bridge with the curve ending right at the beginning of the bridge, but the cab will not.  The bridge has to be slid back about 3 inches down the straight section for the back edge of the cab to not hit the sides.  The 11 feet I have is exactly the distance needed for the bridge, the two approaches and 4 1/2 inches from the walls on each side, and I do not have the room to add the 3 inches on each side to clear the cab.  I can eliminate one of the approaches but that just doesn't look right.  I could crossover the Big Boy to the inside track to cross the bridge too, but that kills it from ever completing a a circuit running with another train on the other track.   I could go through the wall into the adjoining storage area in the attic and come out some other spot too, but then it gets complicated.  So, for anyone considering this bridge setup on a curve the pix show what you will be dealing with.

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Images (4)
  • IMG_6632[1]: Curve ending right at the bridge, no clearance
  • IMG_6633[1]: With curve ending about 3 inches from the bridge, cab clears
  • IMG_6634[1]: Needs abou 3 inches of straight for the cab to clear
  • IMG_6631[1]: Front of loco clears just fine with the curve ending at the bridge
Last edited by CALNNC
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You know, I just went out to look at the girder bridge and your idea is actually practical.  The girder bridge can be cut right down the middle, it will have screw holes that can be utilized  without re-drilling since MTH put 8 in the middle and splitting in half will leave 4 on each side, cleaning up the ends and put against the arch bridge makes it look they were meant to be made that way and I gain the the length I need.  Now I might have the extra  double track girder bridge to sell.  Thanks for this idea Charlie.

I found that the MTH Premier Big Boy has a greater overhang than the Lionel Vision Line Big Boy on either end.  After we modified Harry's layout to handle my VL-BB, I brought the MTH Big Boy up, it promptly smacked into a tunnel portal!

Same thing at my train club. We realized that my MTH Premier Big Boy needs more clearance than the Lionel Big Boy.

I am building my first layout with the help of a friend. The layout has numerous bridges. I, too, had bridge clearance issues with my Lionel Legacy Big Boy. Gunrunner John has been hugely helpful with advice/inputs along the way. When we reached the point of early test runs I told John that we were going to give the Big Boy a try. I did have concerns at two my side- by -side bridges. We had manually pushed the Big Boy through the bridge and it cleared. But John pointed out that, under power, that locomotive would swing out a out 1/4” more. He was exactly right (as usual). We crept it up to the bridge under power and it was going to hit. So, bridge surgery was necessary. I cut the upper superstructure off each end of both bridges, made new structure from strip plastic, glued it in and filled the seams with filler, sanded and primed. I knew that repainting the entire bridge to match would be kind of a pain due to all of the “ins and outs” of the bridge structure. So, I masked the bridge off and painted the upper structure flat black. The Big Boy clears just fine now.

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