Built-in the mid-1920s for a variety of railroads, this version is an example of the Osgood Bradley commuter coaches as done for the Boston and Albany. To complete the kit you’ll need diaphragms (if modeling non-B&A variants that had them), window glazing (I suggest microscope slide covers), and wire for the underframe brake piping and grab irons.
This kit also has doors for the vestibules in place of the gates. Both are designed as static components.
The prototype coaches were built with some small variations but saw service with a number of owners, both original and second-hand. Below is the list as it is currently understood.