To avoid visitor uneasiness, operators from Montreal's transit union were placed at the front of the train to give the illusion that they were conducting the self-sufficient Expo Express. Operators performed mundane tasks, such as opening and closing the doors of the train, to reduce boredom.
According to Wikipedia, there was a minor incident involving an Expo Express operator during Expo 67... at the La Ronde station:
The interior of Expo Express, looking towards the front.
A front view of the train at Place d'Accueil terminal.