Hi Scott,
Thanks. I surfed a little and came up with this listing on Wikipedia:
Manufacturers in the U.S. and Canada and their scale productsWrightway Rolling Stock 1:32 and 10mm scale custom built British North American and European passenger stock.[1] [Ontario, Canada]
Northern Fine Scale Stock in 10mm scale British only freight stock in kit form [2]
Accucraft has five scales - Fn3 is 1:20.3, Gauge 1 is 1:32, their ½" scale is 1:24. They also build 1:29 scale North American models in live steam and electric under the AML brand, as well as British live steam and electric models in 1:19th scale [also called 16mm] and Isle of Man live steam and electric models in 1:20.3 scale - the Isle of Man uses three foot gauge track, the same width as the dominant US Colorado narrow gauge.
Aristo-Craft is 1:29, “Classic” series is 1:24
Aster is 1:32, 1:30 for Japanese prototypes and 1:22.5 for European and Japanese narrow gauge.
Bachmann's "Big Haulers" series is to 1:22.5, while their "Spectrum" Series is to 1:20.3 scale
Hartland Locomotive Works products are engineered to fit with 1:24 scale Narrow Gauge equipment and 1:29 Standard Gauge equipment.
LGB is 1:22.5
Mainline America is 1:32
Märklin "MAXI" is 1:32
MTH Rail-King is 1:32
Piko is 1:27-1:29
USA Trains “Ultimate” Series is 1:29, “American” Series is 1:24
LGB and numerous other manufacturers [Train-Li, PIKO, Peco] produce track made of brass which can remain outside in all weathers – a quick wipe and it is ready for use. Track can also be obtained in less expensive aluminium as well as oxidation-resistant, though more expensive, stainless steel.
Rgds Victor