The difference is in the stationA city can have more than one departure terminal.
A ticket that says Beijing South is not interchangeable with Beijing West. In Shanghai, Hongqiao and Shanghai Railway Station are separate places. A city-pair search is only the beginning of the plan.
Our tool lets you inspect the stations documented for a city and compare planned intermediate-city arrival and departure terminals. A different terminal requires a separate transfer. We intentionally do not invent connection minutes.
An illustrative station-choice exampleBeijing South北京南站 VNP
NOT THE SAME TERMINAL AS
Beijing West北京西站 BXP
Station names and codes from ChinaTravelChina's curated city catalog. Actual train-specific stops must be verified at booking.