| Clue | Source | Date |
|---|---|---|
| High rollers? | New York Times | 23 Dec 2020 |
| The 3rd Avenue line was the last of them to operate in Manhattan | The Washington Post | 07 May 2017 |
| The 3rd Avenue line was the last of them to operate in Manhattan | LA Times Daily | 07 May 2017 |
| The 3rd Avenue line was the last of them to operate in Manhattan | ||
| Loop rollers | ||
| Loop rollers | ||
| Chicago sightings | ||
| They loop the Loop | ||
| Windy City transports |