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Mike, for what it is worth.  The measured overhang for my MTH Big Boy on Gar Grave O72 is 3 1/16-inch.  That is an actual dimension of overhang. You need to add clearances.

 

An addendum to info.  The above is the outside "overhang."  The "inhang" (inside overhang) for MTH BB is 1 1/2-inch.  Both dimensions are from center rail center line.

 

 

Ron

Last edited by PRRronbh

I know that the VL-BB has just about a 3" overhang from C/L on Ross O72 track.  I can also state that the MTH scale Big Boy has more overhang, but I haven't measured it.  We got the club layout running everywhere with my VL-BB right before the pandemic hit, and when I brought the MTH Big Boy over, it promptly crashed into a tunnel portal on a curve that the VL-BB cruised right past.

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