This was the fourth film in three years in which Yul Brynner and Trevor Howard appeared. The others were Morituri (1965), The Poppy Is Also a Flower (1966) and Triple Cross (1966).
The old railway seen in this movie was also used in the movies Red Sun (1971), North West Frontier (1959) and Seven Guns for the MacGregors (1966).
The first movie where long-time friends Trevor Howard and Harry Andrews worked together. They would meet again in Superman (1978) as members of Krypton's Council.
26 minutes in, Gungaram shouts "Down with the British! Down with the Queen! Down with the Raj!" Set in the 1920s, the film takes place in the reign of King George V, whose consort Queen Mary had no political power.