Stewart,
I recognized the flag immediately. Here is a photograph from 1959 showing me and my family (I am the small one with the red shirt) waiting for the Scoot to take us from Bodfish, ME, to Onawa, 3 miles to the east in the Moosehead subdivision of the Canadian Pacific main line from Montreal, Quebec, to Saint John, New Brunswick. Bodfish consisted of this building and some sidings. It's importance lay in the fact it was the only public road crossing on the railroad for 20 miles in either direction (Onawa was a section town and could only be reached by rail until 1962 when the first dirt road was put through the wilderness).
Note the green and white flag we put out to tell the train to stop.
The next slide shows the eastbound Scoot. This was a daily mixed than ran from Megantic, Quebec, to Brownsville Junction, ME. 1959 was the last year it was pulled by steam.
I owe my interest in trains, in general, and steam, in particular, to my early experiences there in central Maine. FWIW, CP sold the line in 1995, and just bought back last month.
And to maintain a narrow gauge connection, the road out of Bodfish to the west went to Monson, about a dozen miles away, original home of Monson #3 and #4.
Rob