Like the Bandit... Like the Gringo... A bullet doesn't care who it kills!
The name of this movie is Quién sabe? released in 1966-12-06 and it's main theme is El Chuncho's bandits rob arms from a train, intending to sell the weapons to Elias' revolutionaries. They are helped by one of the passengers, Bill Tate, and allow him to join them, unware he is an assassin working for the Mexican government..
Duration: 118 min