noun
commuter train
A train service primarily used for commuting between home and work or school, often during rush hours.
朝の通勤列車はいつも混んでいる。
The morning commuter train is always crowded.
通勤電車 is a more common term for a commuter train, especially an electric train. 通勤列車 is less frequent and may sound slightly more formal or refer to longer-distance commuter services.
Compound of 通勤 (commuting) and 列車 (train).