I have the Legacy version of the M1b and I love it. it might be my favorite engine. I was therefore drawn to the M1a listed in the catalogs last year. My question is, will there be enough appreciable difference between the two engines to justify owning them both? I know the M1a will have whistle steam which is great, but are the engines basically the same visually? If they are more or less the same I would probably go in a different direction. I am also looking at the Legacy Pennsy B6... I figure I have time to think about that one.
Thanks for any information you might be able to provide as I consider my first train purchase in a few years.
Ben