Behold the sound of a large electric motor spinning up

This General Electric motor slowly spinning up is a treat for the ears, and TigerTek has a channel full of that sort of thing. This type of engine, surely familiar to train commuters in more muffled form, is said to have inspired the creators of Star Trek in the same way as Stuka bombers inspired Star Wars' iconic Tie Fighter sounds (which were ultimately created by mixing elephants trumpeting with cars skidding on wet roads)