Tubular Track Tutorial - Lionel, Marx, and More

O gauge. O27. O42. O72. What does it all mean? What kind of track do I need?
Episode 61: With dozens of manufacturers making O gauge trains for over a century, many terms have changed meanings over the years. The jargon can be very confusing for a beginner in the hobby - or for someone who has been away from the hobby for a decade or two.
This video attempts to answer the basic questions about tubular track.