Protocraft has been manufacturing tools, track and detail parts for O Scale modelers for several years now and their products continue to grow. What I am most excited about are their line of brass trucks in both standard O Gauge as well as Proto:48. They have a nice variety of brass kits and assembled trucks which I purchased a pair of their assembled, Arch-Bar Simplex trucks in Proto:48 gauge.
The trucks are all brass construction and the solder joints are incredible clean. Additionally, the springs are thicker than most manufacturers provide which adds to the realism of their trucks. The wheels are steal with rib details on the back with scale tread and flanges as well as prototypical tapered axels. Full brake rigging is included and installed.
The trucks are heavy! They run very smoothly and are perfect for adding weight to light plastic or scratch built wooden freight equipment.