| Year | 1988 |
| Date | 06-May |
| Volume | 160 |
| Issue | 3,824 |
| Page | 529 |
| Category | Countryman's Steam |
| Part | |
| Title | Vertical Boilers |
| Author | John Haining |
| Notes | Sentinel and some other vertical steam waggon boilers. The Sentinel waggon boilers, Super Sentinel No. 6722 owned by J.Keeling, Thorneycroft & Leyland 6 ton owned by B.L.Heritage, Yorkshire Engine Co. No. 940 & Fowler No. 19708 owned by Tom Varley, Atkins |