From what I have seen in the last 3 years railfanning the line, as of now you have 120-121, 148-149, 305-306, 307-308. East of Edmundston there is usually a local that runs to Juniper / Chipman area. And I believe a second one makes the MMA interchange at St Leonard and may also work Grand Falls area.
Also on occasion is a 473/474 road job from Moncton to Joffre, I haven't seen this personally, but have seen on the net that this train does run, but not on any schedule and in my 3 days there, it didn't run. Also DPU is up and running, spotted it on last friday's 305. Again only one train was using it.
So, you can count on at least 6 trains daily. 121 or 149 may get cancelled on any given day. It happened on my trip. As of note, we never spotted a local running.
Of course may have MOW work trains working at times, saw this 2 years ago.
Isaac, Brewer Maine.