If you would like to see some more information about Marx Tinplate & plastic, in particular, do take a look at these links. You should enjoy them as much as I enjoyed writing them:
Marx “Customized”…Jerry Custer’s Art
http://reviews.ebay.com/Marx-quot-Customized-quot-Jerry...idZ10000000001674320
Marx “1998” Switchers …Alco s-3
http://reviews.ebay.com/Marx-quot-1998-quot-Switchers-A…idZ10000000001614850
Marx “Postwar” Tinplate Guide -----Lithographed Diesels
http://reviews.ebay.com/Marx-quot-Postwar-quot-Tinplate…idZ10000000001644935
Marx Postwar “Plastic” Diesels
http://reviews.ebay.com/Marx-quot-Diesel-quot-Guide-Mos…idZ10000000001518381
Marx 3/16" Scale Metal Cars
http://reviews.ebay.com/Marx-quot-3-16-Scale-quot-Guide…idZ10000000001455546
Marx Handcars
http://reviews.ebay.com/Marx-quot-Handcar-quot-Guide-20…idZ10000000001236562
Marx Steamers, 666 & 1666
http://reviews.ebay.com/Marx