I have 2 favorites
The Magic of Lionel as that video in the 90"s was a key factor getting me back into the Hobby. It was one late Saturday night I was channel surfing and came across a 30 minute infomercial with Tom McComas and Tom Snyder. Of course I ordered it as operators were standing by at 11pm on a Saturday
My second favorite is great for me in that it represents where I am in the hobby now, which is 3-Rail O Scale Trains and club life. It features Norm Charbonneau and the Griffith IN train club.