My grandsons received a Polar Express Lion Chief set for Christmas 2-3 years ago and over time mom has added various items to their layout. Last Christmas she purchased them the Polar Express Speeder (on back order). Of course she did not realized what TMCC meant and it would not run with the current set. After contacting Lionel they told her she needed a separate controller but failed to mention the need for a base unit. She ordered a CAB-1L (back order again) only to discover when it arrived in September that she could not get the engine to run with just the CAB-1L. At this point grand-pop was called and after some research explained to her she purchased a TMCC engine and the CAB-1L requires a Base-1L. Well of course the Base-1L not available anywhere except used on ebay at a price higher than new Lionel MSP. Reached out to Lionel and they do not have ETA on Base-1L availability and no online retailer is accepting back orders. Makes you wonder about Lionel inventory management when they can't even predict when product is expected to be back in stock.
I know the Base 3 is expected in 2023 but it's capabilities and pricing far exceeds their needs as does the Legacy 990 & CAB 2. I'm sure when they are older and if still interested in the hobby, the latest & greatest of today will have become obsolete.
Grand kids play with the train on a small platform and mom planned to expand it for them to 8 x 12 next year (with grandpop's help). Already told her she'll probably need a larger power supply since the current wall wart transformer will be insufficient. In the 1950's things were much simpler but lacked bells & whistles of today, the price of course is increased complexity and potential quicksand for newbie's.