什麼是地鐵直通運行？

What is subway interlining?

The New York City subway is unique for a variety of reasons, including its interlining. Find out more about how interlining effects your commute.

屯馬線（馬鐵+西鐵（和鹽蛇線（深鐵2、8）就係吧（兩線唔洗轉車坐到尾）

重慶4-0-5號線/5-JT線算一個example

紐約地鐵嗰種直通運行更似香港輕鐵嘅直通運行。