Perhaps some "seven o'clockers" still exist, but the term is mainly historical. If you're lucky enough to find a good job in New York, why live in Philadelphia?
The Lexicon of the Philadelphia Metropolitan Area
by Dennis Stanley Lebofsky
presented to the
Faculty of Pinceton University
in candidacy for the degree
of Doctor of Philosophy
Recommended for acceptance by the
Interdepartmental Program in Linguistics
Seven o'clocker - a Philadelphian who commutes daily between New York and Philadelphia.
19 February 1930, New York Times, pg. 10:
Seven o'Clockers' Klub Holds Annual Banquet
While Commuting From Here to Philadelphia
PHILADELPHIA, Feb. 18. - The third annual banquet of the Seven o"clockers Klub was held tonight in two cars and three overflow platfors attached more or less distantly to a Reading Railroad train. The Seven o'Clockers are, of course, those 200 proud souls who like the Philadelphia air - or locomotion - so well that they speed four hours a day commuting to business in New York.
A new song was tried, however, and it was voted to give it the place of honor hitherto enjoyed by a folk-balled about Esquimaux. The words, composed by some anonymous minstrel, are:
Rickety, tickety, tickety rock,
We leave Philly at 7 o'clock,
Leave New York smack at five;
Ride the Reading, be alive -
Rah, rah rah,
Seven o'Clockers. Rah, Rah!
9 January 1943, New York Times, "War Shunting Luxury Club Cars Off Railroad Lines in the East," pg. 8:
The Reading's Seven O'Clocker from Philadelphia has been discontinued after some twenty years of special service.
4 August 1948, New York Times, pg. 21:
He was a former officer of the Seven O'clockers Club, an organization of businessmen of this city (Philadelphia - ed.) who commuted daily on the Reading Railroad to New York.