Some of what I've read indicates the junction has the "potential" for interchange with PAR (PAS) and P&W at that location. I haven't found any STB filings that it is so used; my assumption that an interchange agreement would be subject to an STB filing requirement.
Given that, my thoughts are that CtDOT, which owns the Waterbury branch, would have to agree to the removal of the connection. Most of the Maybrook portion east of Danbury is OOS although moves have taken place. AFAIK, P&W still does have overhead rights, although they withdrew their adverse abandonment request back in 2015.
HRRC is the common carrier; Maybrook owns the portion of the lines not owned by CtDOT on the Berkshire, and owns all of the Maybrook and Beacon (within CT) (that was a filing back in 2013/2014 I think). Danbury Terminal got merged back around then, too, I believe.
Next stop, Willoughby
~el Jefe ("Jeff Smith Rules") :: RAILROAD.NET Site Administrator/Co-Owner