The film is set in 1973, yet all of the trains seem are in liveries from the 1960's. (While it is true that the last of the crimson coaches weren't repainted until 1974, by 1973 almost all locomotives were blue and coaches blue or blue and grey.)
During the night club scene, the song 'I believe in miracles' was sung. This was not released until 1976. In fact, some patrons dance to disco. In the summer of 1973, there was no music genre 'disco' so any such music would have fallen upon confounded ears.