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Answer for the clue "Chief part of a rail network ", 9 letters:
main line

Word definitions for main line in dictionaries

Wikipedia Word definitions in Wikipedia
The Pittsburgh to St. Louis Main Line was a rail line owned and operated by the Pennsylvania Railroad in the U.S. states of Pennsylvania , Ohio , Indiana , and Illinois . The line ran from Pittsburgh, Pennsylvania west via Steubenville, Ohio , Columbus, ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Shaft \Shaft\, n. [OE. shaft, schaft, AS. sceaft; akin to D. schacht, OHG. scaft, G. schaft, Dan. & Sw. skaft handle, haft, Icel. skapt, and probably to L. scapus, Gr. ????, ????, a staff. Probably originally, a shaven or smoothed rod. Cf. Scape , Scepter ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"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 ...

WordNet Word definitions in WordNet
n. the principal route of a transportation system

Usage examples of main line.

Single railway tracks branched off from the main line, snaking out to the silo yards through narrow cuttings and along embankments.

Only a few pods had broken open on impact with the ground and lay scattered about in small heaps, but the main line of pods led directly to the wreck.

Natural selection was taking its toll along the main line of dominance, too, leading to the one minor branch that provided what was necessary for sentience, for dominance.

It is much harder to decide which experiments not to do because they won't give conclusive results, or will provide merely trivial knowledge, or are a distraction from the main line of the work.

Vorontsyev lay in the shelter of a rock ledge which overlooked the main line between Khabarovsk and Vladivostok.

They would have to be re-quartered and housed in an area that would not be in the main line of Hollander's presumed direction of attack.

Here, close to shore, a freight siding swung in from the main line leading into the plant proper.