The film takes the "slow train" driving deep in the mountains and the conductor's boring work position as the carrier, through the main character Cheng Lu, Zhao Dapeng and to Pingping two young college students and young conductors
| Actor | Role |
|---|---|
 Huang Haoyue向萍萍 | 向萍萍 |
 Zhang Chenxi程路 | 程路 |