The place that PanAm refers to as Falmouth or CPF192 isn't actually in the town of Falmouth, but is at the east end of a siding that is near the town line. Hey, it was good enough for them. It's at 1383-1425 Riverside St Portland, ME 04103 43.715476, -70.302745. Some of these pictures are there and some are actually in Falmouth.
Woodville road doesn't have any good parking, but it is double track, a long siding from Field Rd to Royal Junction, and an uphill grade for eastbound trains. It's at mp 188, 43°45'45.2"N 70°15'55.2"W. Muirfield Rd is a private way but one or two cars is not usually a problem if they mind the speed limit and keep the noise down.
Videos
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MEC 381, 383, & 510 pull RUPO through Falmouth (CPF 192) in Portland on August 24th of 2019. Photo by John Erickson.
Amtrak 691 westbound at Falmouth (CPF 192) with AMTK 818 and 90220 on September 28th of 2019. Video by John Erickson.
Amtrak 90, & 90224 run 691 eastbound past CPF 192 in Falmouth on September 5th of 2020. Video by John Erickson.
Amtrak 20, & 88 run 694 westbound past CPF 192 in Falmouth on September 5th of 2020. Video by John Erickson.