| Year | 1954 |
| Date | 23-Dec |
| Volume | 111 |
| Issue | 2,796 |
| Page | 726 |
| Category | Locomotive |
| Part | |
| Title | Twin Sisters |
| Author | J.I.Austen-Walton |
| Notes | Elevations and section of the poppet-type regulator, a combination fitting, regulator handle, formation of spiders, steam port cutting, one is apt to forget |