...the line is expected to remain out of service until at least the end of March.Per a 0200/03-06-2020 visit to the NS website. Italics mine.
...NS continues to work with our interline rail partners on detouring over alternate routes:
General Merchandise traffic to Ayer is moving over a detour route. Due to lower detour capacity than originally calculated, NS is reestablishing the embargo on this traffic that was lifted Sunday, Feb. 23. NS will allow permits as the backlog of traffic is worked off.
Automotive traffic to Davisville, Rhode Island, will move over a detour route. The embargo was lifted Friday, Feb. 21.
Automotive traffic to Ayer remains under embargo but is allowing permits to match our detour capacity.
Intermodal gates remain closed to all shipments billed for movement to and from Ayer.
Customers with traffic moving through this area should expect delays of 48-72 hours.