There are a lot of large niches in Lionel collecting that a podcast could easily go with each: prewar, postwar, MPC, Lionel Trains Inc., early and later Lionel L.L.C.
I know there's a huge amount of collectors who extremely knowledgeable about postwar Lionel, but as a result it's so common to see every source of information on the hobby talk about postwar. I agree with @brianel_k-lineguy that I would be far more interested in an article about Lionel Trains Inc. products or something that occurred then that was significant because that was my childhood and it's the era of Lionel I am most knowledgeable in.
The Madison Hardware book you did peaked my interest greatly because it was a huge moment in Richard Kughn's era at Lionel, and I vividly remember that story when TM did a video on it in 1991.
An informational article about all the big steam engines that Lionel Trains Inc. did is an article I would be extremely interested in, or maybe on the products Mike Wolf had a hand in developing for Lionel then.
