In the August 1, 1930, Maine Central timetable, a full page is devoted to listing all trains and their equipment.
Of the 62 trains listed, only three pairs had names: Nos. 8 & 71, The Gull, Nos. 43 & 44, Pine Tree Limited, and Nos. 203 & 204, The Rangeley. The latter train carried the summer-only through sleepers between New York/Washington and Kennebago, and had a dining car Portland-Rumford.
Curiously, Nos. 153 & 156, which carried the summer-only through sleepers between Washington/Philadelphia/New York and Mount Desert Ferry/Kineo, the famed Bar Harbor Express, had no name in this Maine Central timetable's equipment listing (although it was designated by name in the tables themselves).
Clearly, the Pine Tree Limited was the premier day train on the line.
No. 44 left Maine in the morning and arrived in Boston around lunchtime (10:20 am EST, 11:20 EDT). It carried a parlor car, Waterville via Portsmouth to Boston.
No. 43 left Boston at the end of the business day (3:30 pm EST, 4:30 EDT) with the following equipment: "Parlor Car (Broiler Buffet) and Coaches, Boston via Portsmouth to Bangor, and Broiler Buffet Parlor Car to Rockland. Dining Car Boston to Portland. Daily, except Saturday and Sunday, June 27 to September 5, inclusive, Sleeping Car Boston to Halifax, and Fridays only New York to St. John and Halifax. Coach Boston to St. John, except Saturdays."
The summer-Fridays-only sleepers from New York came up on the New York-Portland day train, the Down Easter (the predecessor to the East Wind) and were switched into the Pine Tree Limited at Portland. The summers-only St. John and Halifax sleepers in this train continued beyond Bangor in the Pine Tree Acadian several hours ahead of the Gull. There must have been a lot of patronage between New England and the Maritimes to have two overnight trains on this route in the summer.
In the post-war period, there were five named trains on the Boston-Bangor trunk:
To Boston, the morning Pine Tree, midday Kennebec, and afternoon Flying Yankee (via Lewiston), plus the overnight Penobscot and Gull.
From Boston, the morning Kennebec, noontime Flying Yankee (via Lewiston), and afternoon Pine Tree, plus the overnight Gull (via Lewiston) and Penobscot.
The Penobscot carried the through sleeper to/from Van Buren via the BAR.
The only two train names (and schedules) common to both the pre-war and post-war periods are the Gull and the Pine Tree (Limited).
Formerly of Pittsfield and Waterville (Maine), New York City, Montréal, and San Francisco.