It's really interesting. Lucky Ned and his gang gathered at their hideout to divide up the spoils of a train robbery. In neither movie did the surrounding countryside seem like it would be suitable for anything that developed.
The train they were supposed to have robbed was the Katy Flyer. This was a real train on the Kansas-Texas (KT) Division of the Missouri Pacific Railroad.
While little known, the rail line was immortalized in the Blues standard, "She caught the Katy"(left me a mule to ride,) which was featured in "The Blues Brothers.
In the book the division of the spoils was psychotically unfair. Ned got like 50% which came to several hundreds of dollars. One henchman, "The Doc," got almost as much. The Farrell Brothers got like $50 USD each.
Ned and the Farrells died in the shootout with Rooster. The 4th henchman, alternatively called The Doc or Mexican Bob, depending on the book or movies, got away clean.