DANGER! DANGER, WILL ROBINSON! This is *definitely* a work in progress, and is likely not even all that accurate yet. Much of what follows is incomplete, riddled with copy/paste errors, etc. Please don't take any of the following as gospel until this notice is removed.
Note: The definitive reference book on D&RG / D&RGW narrow gauge passenger cars is Colorado Rail Annual #25, "Rio Grande Narrow Gauge Varnish", by Herb Danneman.