Portland Exposition Building Union Station Mural steamers

I was in the Portland Expo tonight for the Red Claws game, and afterwards I spent a little time looking closely at the mural of Union Station over the entrance to the arena. I noticed that there's a lot of detail there: camp buses to Camp Chipewa, a Porteous, Mitchell and Braun truck, a "Tours of Portland" poster. Most of all, there are 4 trains depicted on the tracks at the station, and I am wondering if anyone knows anything about the steam engines shown, or even if they existed at all.

Track 1 (I have no idea how the tracks were originally numbered, so I'm starting closest to the station and moving compass-west): MEC 462
Track 2: the Flying Yankee; we have a whole thread on this one already
Track 3: BM 3686
Track 4: MEC 164.

Any ideas or info would be appreciated.

Actually, there are Two Flying Yankees in the mural. Per p. 137 of Harry Frye's Minuteman Steam: Boston & Maine Steam Locomotives 1911/1958, 3686 and 3989 were repainted in a two-tone green scheme along with white sidewalls and chromed cylinder heads and Flying Yankee cast on brass plates below their headlights as well lettered on the cabs below the sash in June 1930. How long the scheme was maintained isn't certain, but it may have lasted after the 6000 arrived. P. 141 shows both locomotives as 12/1916 Schenectady products, with scrapping dates of 2/1952 for the 3686 and 8/25/1955 for the 3689.
My resources for MEC steam are thin.

MEC steam roster in the Mountain Subdivision book lists 164 as a class K-5 0-6-0 built by Alco in 1910. Various books
in my library depict higher and lower numbered 0-6-0's- but not that one. As an aside, the PT's 0-6-0's were numbered
in the 800's in the pics I've got.

Bill Robertsons book Maine Central Steam Locomotives lists the 164 as a 1910 Alco 0-6-0 Built in Schenectady.

462 is a 4-6-2 also built by Alco-Schenectady. 1913.

No notes on final disposition or dates.

Mike