In 1941, Japan expands the war to Southeast Asia. The Tianjin to Nanjing railway in East China became a key transportation route. Chinese railroad worker Ma Yuan leads a team of freedom fighters, using their deep knowledge of the train network to derail the Japanese war machine. The Chinese call the unlikely heroes the “Railroad Tigers”. When the Japanese send reinforcements to Shandong, Ma Yuan launches his most dangerous mission yet, blowing up a heavily-guarded railroad bridge. When the Japanese learn of the crippling plan, which will slow down the war, the stakes are raised to a new high.