The Professionals (1966)

A rich Texan, J.W. Grant, selects three men and invites them to his private train to offer them a contract: Rescue his wife who has been kidnapped by a Mexican revolutionary. The leader of the men, Rico, decides they would be a better team if Grant would hire one more man, an explosives expert. Grant quickly agrees and soon the four are off to complete the contract. However, while on the trail, they discover some interesting facts, like has Mrs. Grant 'really' been kidnapped?