Chennai Express [repack]

One detail: "The Chennai Express" is mentioned in title. Title: "Chennai Express: The Lifeline..." So "Chennai Express" (no "The" in title proper noun?). Actually, the train is often called "The Chennai Express". In the text: "The Chennai Express is one of..." In the title: "Chennai Express: The Lifeline..." So I replace "The" in title.

Text: Chennai Express: The Lifeline of Southern India Chennai Express -> Keep. : -> Keep. The -> The Lifeline -> Backbone of -> of Southern India -> Southern India (Proper noun). Keep. -> Keep. Chennai Express

One final check on "The Chennai Express" at the start of sentences. "The" -> This. "Chennai Express" -> Keep. One detail: "The Chennai Express" is mentioned in title