This question interests me because the NYC line involved was the Adirondack Division and we discussed this at some length not long ago in the forum.
Thread link. There's another thread pertaining to this route as well.
Here.
Basically the ETT schedule bagman posted shows trains running on the Lake Placid Branch of the Adirondack Division. In looking at some system timetables this was a winter schedule -- in the early 1950s there was still a third train on the branch in the summer -- and the times correspond with the schedule that took effect in September 1952.
Below I have inserted an Adirondack Div. schedule from the September 1952 system timetable. Note that Trains 2 and 3 originate/terminate at Lake Placid. Trains 4 and 5 originate/terminate at Montreal. So Trains 104 and 105 shown in the ETT listing are actually connecting trains from/to Lake Placid that connect to the Utica-Montreal trains at Lake Clear Jct.
In September 1952 No. 104 handled a Lake Placid-New York City sleeping car and through coach to Lake Clear Jct. for No. 4. No. 4 then connected with No. 44 at Utica. No. 44 was the
New York Special running Chicago-New York via Detroit. No. 4 also handled a Montreal-Buffalo sleeper, connecting to No. 35 the
Iroquois at Utica. No. 35 was a Boston-Chicago train that ran via Cleveland.
No. 4 arrived Utica at 2:10 AM and presumably the crew, locomotive (and perhaps a local coach) turned as No. 5 which then departed Utica at 3:00 AM. At Utica No. 5 connected with No. 21, the
North Star, a New York-Cleveland train (with a Toronto section). No. 5 picked up a New York City-Lake Placid sleeping car and through coach from No. 21 at Utica. The Lake Placid cars were then handled by No. 105 between Lake Clear Jct. and Lake Placid. In addition, No. 5 also picked up a Buffalo-Montreal sleeper at Utica from Train No. 46 the
Interstate Limited from Chicago via Detroit.
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