The private charter passenger car Caritas, a sleeper lounge dining observation car, was built in 1948 for service on the St. Louis-San Francisco streamliner The Texas Special. In 1965 it was sold to Canadian National for their streamliner train The Super-Continental. It was rebuilt as private car Caritas by November 1984. On April 23, 1996, the Caritas ran on the back of the regularly scheduled Amtrak Pioneer, from Portland, Oregon, to Denver, Colorado, where it connected with the eastbound California Zephyr to Chicago, Illinois. Here, the Pioneer and Caritas zip through Laramie, Wyoming, on Union Pacific’s Overland Route (Laramie Subdivision), eastbound to Cheyenne (Borie), before turning south on UP’s Denver Pacific line (Greeley Subdivision) to Denver. The last trip of the since discontinued Pioneer took place on May 10, 1997.