专线 (zhuān xiàn) — dedicated line (telephone, bus, railway, etc.); hotline (customer service or special-purpose phone line)

Definition

Examples

• 请拨打客服专线咨询问题。
  Qǐng bō dǎ kè fú zhuān xiàn zī xún wèn tí.
  Please call the customer service hotline to ask questions.
• 这条公交专线直达机场。
  Zhè tiáo gōng jiāo zhuān xiàn zhí dá jī chǎng.
  This bus line goes directly to the airport.
• 铁路公司开通了一条货运专线。
  Tiě lù gōng sī kāi tōng le yì tiáo huò yùn zhuān xiàn.
  The railway company opened a dedicated freight line.