When the Monorail opened it began nonstop operation with only minimal maintenance problems, never any major problems. It was after two weeks that the imagineers received a telegram from Professor Wengatz of the Alweg Company in Germany (the company that built the monorail.) The telegram said: STOP CONSTRUCTION OF MONORAIL TRAIN — IMPOSSIBLE TO WORK.
Bob Gurr, an imagineer, replied with a telegram of his own and invited the German professor to come take a ride for himself. By the time the Alweg workers had encountered the problems with their monorail, Disney imagineers had already solved them. Say what you want about the power of German engineering, it’s no match for Disney imagineering!
Growing up in Los Angeles in the 70s/80s we visited Disneyland on a regular basis and often after school, before "Annual Passes".