Does this set have a good upgrade path, or should I start with a different set? By upgrade path, I mean the use of the remote electronics system for accessories and other features. For example, would I be able to continue to use the same engine and transformer, which are the two most expensive components of the set? I am new to Lionel. The two sets I had in my lifetime were a basic American Flyer in the 50's inherited from my older brothers, and a small Bachman HO set in the 80's. I'd like to really grow into the new Lionel.