Last time I saw a train parked on the N.Berwick passing siding was in 1998,or 1999,prior to the rehab.(had two GP-9s so I remember it).
I have a current track plan,and one dating back to 1953,when line was mostly double tracked most of its entire length.
Hussey Mfg. has not used rail in many a year,and last cars I saw down there was in the 70's and these were loaded trailers going out on the piggyback ramp.
As far as "not using the CS",this is NOT unusual for Guilford. Walnut siding,between CPF 185 and MP 183,was out of service for about 5 years,not being put back until this past summer. There are a couple of other O/S passing sidings in District I; Winthrop is one.
It is NOT only the Downeaster,but with Guilford trains canning due to crews hours,they need "places to park them".
Bud