Cassidy put together a plan for robbing the train at Wilcox, Wyoming. He decided not to take part personally because of his promise that got him pardoned from the prison in Laramie years earlier.
His gang stopped the train near Wilcox at just past 2am in the morning on June 2, 1899. They blew the baggage car apart just like in the movie, Butch Cassidy and the Sundance Kid.
Although historians seem to agree that Cassidy planned it, many believe the robbery was actually pulled off by Kid Curry, Flat Nose George Curry, and Cassidy's best friend, Elsa Lay. Kid Curry claimed that Sundance was involved which fits in with the fact that Sundance and Kid Curry had ridden together for years. Kid Curry also claims that Elsa Lay was not there because he had gotten bored
with life on the WS ranch and left Cassidy to ride with the Ketchum gang. That makes sense too considering the trouble he got into at Folsom, NM.
The robbery at Wilcox was a tremendous success. Everything went like clockwork and the loot taken ammounted to about $30,000.