The Limited just passed the last station.
2 seconds sound clip from Superman (1948) - Superman Comes To Earth (Chapter 1).
You can hear this line at 00:18:51.221 in the Blu-ray version of the episode.
Quote context
[...]
- But, Lois, I was gonna take a pic...
- Well, he should be. That crack flier races through here, and she's loaded to the hilt.
- The Limited just passed the last station.
- You... You'd better call the emergency hospital and have them standby.
- Hey, this train is really going. The engineer must be late for dinner.
- The way he's traveling, he hasn't eaten all week.
- This looks like a job for Superman.
- Can even Superman save this train from destruction?
[...]