This photo is a detail of Maine Central 470, an old steam locomotive that was on static display in Waterville, ME since I was a kid. It is a 4-6-2 "Pacific" type steam locomotive built by the American Locomotive Company (ALCO) in May 1924 for the Maine Central Railroad (Wikipedia)
It is currently being restored with plans to have it operational again by 2024 for its 100th anniversary.