@SteveH posted:Lionel does make 031 curves in FasTrack, they come in 45 and 11.25 degree arcs... They also make O31 FasTrack switches.
@B rad posted:Thank you for that information. I did not realize lionel offered o31 in anything. I do not use any switches.
To remain consistent with FasTrack geometry, and in a departure from tubular "O" geometry, FasTrack O31 really is 15.5" radius, with an overall diameter including ties & roadbed of 35".
"O" is 14.14" radius, so there may be some wiggle-room on what will run on the FasTrack version.