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O27 cars are the smallest of the 'O' scale Lionel cars and locos. They are quite a but undersize to be good runners on very sharp curve track, 27 inch across the center to center of a circle. The regular postwar "O" series of cars were a bit larger, and some of the locos are a lot larger, barely making it around the 31 inch to the centers diameter. Today Lionel, Weaver, Atlas, MTH and others produce accurate scale size "O" cars and locos that in theory could bo placed on the Holiday Loop in the future. Its also possible that someday he might upgrade his track to O31 or one of the newer design track systems, all of which are a bit taller than O27. I would suggest making the clearances at least open enough to clear regular size postwar cars and locos on the larger/taller track. Many of these postwar cars are actually being reproduced today! <br /> <br />We have a LOT of fun with our Postwar 3 rail! <br />Jennifer and Mike
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