Bumping this nearly 13-year-old thread with newly found information! The MVRR is quite a hard railroad to dig any info up on.
The railroad was incorporated on March 9, 1878. The railroad was proposed to operate between Reading Jct (where the Eastern Railroad and Boston & Maine met near Sullivan Sq) and North Wilmington. It would have forged its way through Eastern Somerville and South Medford, crossing the Boston & Lowell near the Mystic River and Boston Ave. It would have shimmied up between Mystic Lake and the Boston & Lowell through West Medford and Winchester, before taking a turn for Winter Pond. The railroad would have cut right through Winter Pond and around the west side of Horn Pond. It looks like at about Library Park, the proposed railroad would take a path which would later become the northern end of the Woburn Loop, all the way to North Woburn Jct. At North Woburn Jct, the proposal was to simply cross the Boston & Lowell and sort of follow where Parker St and Adams St are today. Coming into North Wilmington, the railroad would have paralleled Middlesex Ave 400ft to the east, from Federal St to the Boston & Maine. The rumor in Wilmington was that the railroad would ferry freight between the B&M and B&L, which doesn't seem to make much sense. One theory is that the railroad was trying to come off as a threat to illicit a buyout from either railroad. In 1882, however, with no railroad operating still, the Treasurer disappeared -- as well as all the cash the railroad had on hand. In 1885, the Boston & Lowell completed the northern end of the Woburn Loop, perhaps lifting the MVRR's plans to do so, as the routing appears the same.
Modern day traces seem to be limited to Wilmington, where Mystic Ave was built upon the Mystic Valley Railroad's right-of-way. A right-of-way is visible through a swamp near Lowell St.
Story:
http://homenewshere.com/wilmington_town ... 35ecf.html" onclick="window.open(this.href);return false;
Map:
https://collections.leventhalmap.org/se ... :x059cc75x" onclick="window.open(this.href);return false;
Mystic Ave:
https://www.google.com/maps/@42.5644389 ... a=!3m1!1e3" onclick="window.open(this.href);return false;
Suspect ROW:
https://www.google.com/maps/@42.538832, ... a=!3m1!1e3" onclick="window.open(this.href);return false;
The map that tipped me off that such a thing ever was proposed and led me down this rabbit hole:
http://www.wardmaps.com/viewasset.php?aid=4042" onclick="window.open(this.href);return false;
Special thanks to Buttersrow for the collaboration.