The "flavor of the week" symbol for Waterville to NMJ is actually WABK/BKWA as of this week. BK-1 is the mill switcher that does mornings at Bucksport. Two jobs, depending on day, operate out of Old Town as OT-1 or OT-2. Last I knew, the actual NMJ switcher is NM-1. I think they run daily except Saturday, but things change. Like already said, WASJ/SJWA is the only train that can normally highball NMJ if it has the time(not often). However, like a couple Saturdays back, SJWA actually switched Old Town instead of the OT job. So, typical PAR with "whoever is around does the work" mentality.
MD-1 does the Madison Branch, and SAPPI jobs do the Hinckley Branch.