After re-reading this thread, I think it is well suited for this forum membership, but also for guests that visit via their Google search. I give them credit. For example, if my wife was a single grandma, and she found this thread she would say "Okay, I'll get that bigger Lionel version that plugs right in." Whereas, my daughter that would be on a tighter budget would give the laptop charger a try.
Luckily both of them would probably go directly to the "old man at the hobby shop" (my daughter's words) and take his advice, instead. Luckily all of our shops are good ones.