The double-archbar swing-motion truck used by the Canada Atlantic, Grand Trunk and various other railways.
The model is optimized for Proto:87, and you'll find that the brake beams need straightening, but will bend back into shape with a little coaxing. Don't try for a sharp bend as the material will break.
This model is optimized for the Alan Gibson Proto:87 wheelsets on 22.7 mm axles. The journals are the correct scale distance apart. This means it will not work for coarse-scale HO. For coarse-scale, use the model that is optimized for NWSL wheelsets
For more photos see flickr.