1952 cover from Arlington, South Dakota, to San Francisco, but then forwarded to Grand Junction, CO, that was on a Union Pacific express mail train No. 5 that emerged from a tunnel near MORGAN, UTAH, and ran into a petrol tanker carrying 6800 gallons of gasoline that had skidded on ice, crashed through a guard rail and exploded on the railway line. Nine railway mail cars were gutted. Recovered mail received a violet 3 line cachet. This cover is the one illustrated in Hoggarth and Gwynn showing the Type 2a cachet. A fine example from this crash, and a desirable item for any collector of ‘gasoline’ as well.