Old O-Gauge Curves

31. This track uses the same rail as STG. The proper switches are 022. The Ross tinplate switch. The K-Line super snap switches. The K-line shadow rail and super snap track have this higher profile. 027 track is a lower profile.

There are kits available to convert 031 track with a 72 diameter to 5 rail track that can run STG and O gauge trains. It is thought the same can be done with 54 diameter O31 track using STG 57 track unassembled to make the kit. The kits are made by USA track. You supply the O-gauge track they suply the outside STG rails ties and insulators.

Another tidbit on the old tubular track. The 0-27 has brown ties while the O-31 has black ties.  This may not have always been the case, but it has recently.  I use the black tie version on my tinplate layout.   

Okay, so I have 31 diam. curve pieces, measured to the outside rail.  Thank you gentlemen.

You mention switches.  What I want to run on this is old prewar Ives, Flyer, and Marx tinplate that I have on the shelves.  The Ives is fine, but the Flyer and Marx locos have big gears on the inside of the driver wheels that really seem to have a problem with the 022 switches.  Is there a good switch that will mate with this high profile tubular track which doesn't have such prominent guard rails and will let the Marx and Flyer drivers through?

Or for these locos should I go to 027 after all, i hear there is an 1121 switch in 027 that will work for this?  I would rather stick with the older high profile, sturdier O Gauge tubular.

As I remember from 60 years ago the AF 31" switch will work. They also have a 40" one as well.

thank you oo, i'll look into the flyer 31" switch.  that would match the radius of my curve sections.

Send me an email and I will send you a pair. No cost.

wow.  thank you sir, that's too good an offer to refuse.  email on its way.