A while back, we added the videos for Calculus Revisited by Professor Herb Gross, which have turned out to be very popular and still quite useful to many students.
We’ve recently published another course from the archives—Electronic Feedback Systems by Prof. James Roberge. The course includes 20 videos recorded in 1985 and an online textbook. It is a great adjunct to the more recent course, 6.302 Feedback Systems also by Prof. Roberge, who has provided a wonderful explanation of the history and continued relevance of the course contents.
Take a look at the final Electronic Feedback Systems lecture video, in which Prof. Roberge applies feedback systems principles to model trains.

And speaking of model trains, did you know MIT has had a Model Railroad club for more than 60 years?