This 43' Three Bay Open Ortner Rapid Discharge Hopper with Crushed Gravel Load is painted green with white side and end lettering.  It's primary use by Western Paving Co. was to transport gravel to the Denver International Airport during its construction.  Ideal for carrying heavy aggregate, the "Rapid Discharge" design is able to self clear through the rails within 30 seconds.  After several cars from this series were scrapped as a result of a wreck, only a few cars were seen for some time after the completion of the work at the Airport.