This is an N scale kit for a pair of Baldwin RT-624 truck side frames. These have been designed to be used with Atlas C-628/630 power trucks.
This kit is only printable in the FUD & FXD materials, except for the dummy chassis, and will require cleaning before painting. I recommend washing with warm soapy water then soaking in 'Goo Gone' or similar product for about 24 hours. Then rinsing off with warm water and allowing to dry.
For more information please see my blog - www.jamestrainparts.wordpress.com