| Clue | Source | Date |
|---|---|---|
| Transport of mine? | Wall Street Journal | 05 Oct 2024 |
| Collier's tram | Premier Sunday | 11 Aug 2024 |
| Mine vehicle | Premier Sunday | 07 Apr 2024 |
| Mine transport | Thomas Joseph | 10 Feb 2024 |
| Coal conveyor | Wall Street Journal | 23 Dec 2023 |
| Mine vehicle | Eugene Sheffer | 14 Jan 2023 |
| Mine vehicle | Eugene Sheffer | 15 Dec 2021 |
| Coal mine vehicle | Premier Sunday | 10 Oct 2021 |
| Vehicle in a mountain | The Washington Post Sunday | 15 Dec 2019 |
| Mine vehicle | Universal | 14 Sep 2019 |
| Mine vehicle | Eugene Sheffer | 15 Mar 2019 |
| Mine vehicle | ||
| Part of some freight trains | Newsday | 25 Feb 2018 |
| Hematite holder | Newsday | 09 Jun 2017 |
| Mining vehicle | Newsday | 05 Mar 2017 |
| Mine vehicle | The Washington Post | 15 Oct 2016 |
| Mining vehicle | The Washington Post | 10 May 2016 |
| Collier's transport | New York Times | 25 Oct 2015 |
| Collier's transport | ||
| Rock roller | ||
| Rock carrier | ||
| Mine sight | ||
| Mine sight | ||
| Mine hauler | ||
| Freight-train unit | ||
| Vehicle in a coal mine | ||
| Mine vehicle | ||
| Mine vehicle | ||
| Transport of mine? |