The main line train is delayed due to maintenance work.
main line
Frequency:
60
%
The main line of our business is customer satisfaction.
main line
Frequency:
50
%
The main line road is closed for construction.
main line
Frequency:
45
%
The main line water supply is contaminated.
Idiomatic Expressions for main line
Phrase: main line of business
Meaning: the primary focus or core activity of a company
Usage: Although they offer various services, their main line of business is IT consulting.