Soleil rouge Banda sonora (1971) BSO

The Japanese ambassador is traveling through the Wild West by train, when gangsters hold up the train, to rob a gold shipment. They also carry an ancient Japanese sword the ambassador was carrying as a present for the US president. The ambassador's bodyguard (Toshiro Mifune) will go after them, with the aid of one of the gang's leaders betrayed by his pals...