A little north of Boston and been the last two years and looking forward to this year's show as long as it doesn't snow.
Don't forget Woodland Scenics and Scenic Express who usually have large displays and a lot of non-specific vendors like Mianne and others.
The MGM casino opened a few months ago in downtown Springfield, so that may be an option for a place to stay, eat and make a little money to pay for more train stuff - hopefully !