HOn3 Model Trains - Blackstone Models D&RGW #55227 HOn3 Denver & Rio Grande Western Gramps frameless tank carModel is in excellent condition. These models represent the frameless tank cars that traversed the Denver and Rio Grande Western and the Rio Grande Southern Railroad's track throughout Colorado from 1939 and into the 1960s. Originally built from former standard gauge cars in the early 1930s, many of this class had the prominent silver letters of the "GRAMPS" logo emblazoned across their sides around 1939 while transporting oil from Chama, New Mexico