Shay locomotive on display at Biddeford ME railroad station?

Now I know this engine clearly isnt from the Boston & Maine, ut I thought this would be the most appropriate place to ask. On a recent trip to maine I just happen catch a glimpse of this engine as I was passing by. Whats the history behind this? It doesnt seem ot me like a locomotive with a Maine origin.... or something you'd normally find at an Amtrak station. It was a very nice suprise seeing it there. Any info on the subject is much appreciated.

Answer can be found at http://www.railroad.net/forums/viewtopic.php?f=126&t=97500