There are some side-lines, with but two or three trains a day—side-lines that reach the main-line only through other branches.
I didn't want to advertise our troubles to a main-line official.
Finally, after a vast amount of argument, the main-line divisions were settled, and attention was given to the side-lines.
Banks and the cowboys, waiting breathless, saw Harvey with a determined lurch close the main-line contact.
Following breakfast, the morning being a beautiful one, Alex determined on a walk, and set off along the main-line to the west.
The Natural Bridge is not far from Field, the main-line railway town that serves as a center for this national playground.
The main-line engine she's built for speed as well as power.
There is a regular cordon of guides—like me—drawn across the entrances to the main-line platforms—unostentatiously, of course.
It was now just half-past eight, and the station showed all the animation inseparable from the departure of main-line trains.
You may see the wrecking-train at every big yard, waiting on a siding which has quick access to the main-line tracks.
"principal line of a railway," 1841; meaning "affluent area of residence" is by 1917, originally (with capitals) that of Philadelphia, from the "main line" of the Pennsylvania Railroad which added local stops to a string of backwater towns west of the city late 19c. that helped turn them into fashionable suburbs.
The Main Line, Philadelphia's most famous suburban district, was deliberately conceived in the 1870's and 1880's by the [Pennsylvania] Railroad, which built high-toned housing developments, ran hotels, more or less forced its executives to plunk their estates out there, and created a whole series of somewhat spurious Welsh towns along the railroad tracks. ... Now everybody assumes these all date from 1682, like the Robertses; but as Chestnut Hill people like to say, "nobody but Welsh peasants lived on the Main Line till the Railroad built it up." [Nathaniel Burt, "The Perennial Philadelphians," 1963]The original station stops were, in order out from the city, Overbrook, Merion, Narberth, Wynnewood, Ardmore, Haverford, Bryn Mawr, Paoli. The train line for commuters along it is the Paoli Local.
[first sense fr the railroad between Philadelphia and the wealthy suburbs to the west]