I like your idea of running a line into Downtown Gorham. I think that's the only way to make a western suburb commuter line work. Trying to run something solely along the Mountain Division line up into Standish takes it away from the core of the western suburb population.
Oddly enough, there used to be a rail line running from Downtown Westbrook through Downtown Gorham and beyond (Sanford, Rochester, etc.) It was the Worcester, Nashua and Portland Division that become the Sanford and Eastern Railroad line that was in operation until the 1960's. Some of the tracks remain today along William Clarke Drive in Westbrook (which was built along the railroad right-of-way). The Sebago Brewing Co. restaurant in Gorham is the old train station on this line for Downtown Gorham. I just tried to find the right-of-way on Google Maps (obviously much of it is overgrown now) and it looks like it wouldn't be re-buildable.
The following was part of the feedback that I sent to the Gorham East-West Corridor Feasibility Study a couple years ago withn my suggestions for stations/platforms along this potential commuter line:
Station/Platform #1 – Portland Transportation Center
This idea is a pretty obvious one. The station, platform and parking lot are already in existence.
Station/Platform #2 – Westbrook Larrabee Road/Blue Rock
A station at this location would provide: (a) easy access to I-95; (b) easy access to Rt. 25 and the Westbrook Arterial; (c) ample room for a large commuter parking lot; and (d) the lease impact on residents, businesses and traffic around the station/platform. Pike will be abandoning this property and selling it soon, so it would be wise for the PACTS to consider negotiating an option to buy the land on the southern end of the property near and along the Mountain Division line.
Below is a Google Maps link to this location:
http://maps.google.com/maps?hl=en&ie=UTF8&ll=43.672086,-70.333512&spn=0.002918,0.006958&t=h&z=18
Station/Platform #3 – Westbrook Downtown/Warren League Grounds
There is an obvious need to place a station or platform in Downtown Westbrook, but where would you put one? Well, my idea is to use the current baseball field known as the Warren League Grounds at the end of the short Stevens Avenue in Westbrook. This field was for years the home of Westbrook’s high school baseball teams, as well as Westbrook’s Senior Little League/Babe Ruth League. However, with the completion of the new fields at Westbrook High School and proposal for another field at the new Westbrook Middle School, the need to maintain Warren Leagues Grounds as a baseball field no longer exists. This field could easily be turned into a parking lot or even a two-level parking garage, with a walkway, steps, escalators and/or elevators leading up to a platform along the railroad tracks just east of the “Black Bridge.”
This location, along with a reconfiguration of the intersection of Main Street, Stevens Avenue and the Westbrook arterial, would provide direct access to the Westbrook Arterial (and thus I-95) and Rt. 25. It would also limit the impact on residents and business in other parts of downtown by building the station/platform in a somewhat blighted area.
Below is a Google Maps link to this location:
http://maps.google.com/maps?hl=en&ie=UTF8&ll=43.680687,-70.354729&spn=0.002917,0.006958&t=h&z=18
Station #4 – Little Falls/South Windham/River Road
While a station or platform directly in the “downtown” area of Little Falls/South Windham would greatly benefit that area in terms of potential growth among business in that “downtown” area, there is no room for a sizable commuter parking lot. However, just west and north of South Windham along the Mountain Division line and accessible from River Road is a patch of undeveloped land along the power lines. A sizable commuter lot and station/platform could be constructed is this location with little-to-no impact on area residents.
Below is a Google Maps link to this location:
http://maps.google.com/maps?hl=en&ie=UTF8&ll=43.746212,-70.431494&spn=0.005828,0.013915&t=h&z=17