This 1973 film stars horror greats Peter Cushing and Christopher Lee! From the wikipedia article:
Horror Express was a Spanish production directed by Eugenio Martin. It was filmed in Madrid in the years 1971-1972, a low budget film ($300,000) with the luxury of having three familiar genre actors in the lead: Christopher Lee, Peter Cushing, and Telly Savalas. The film was co-produced by American filmwriter/producer Bernard Gordon, who had collaborated with Martin on the 1972 film Pancho Villa (which also featured Savalas in the title role). The filmmakers used both the miniature train and interior train set from Pancho Villa for Horror Express. The challenge was that they only had one set to be used as an interior train car. All of the scenes for each train car had to be shot at once, then the set would be rebuilt as the next car.
