| Year | 1928 |
| Date | 02-Feb |
| Volume | 58 |
| Issue | 1,395 |
| Page | 114 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | High Speed Mobile Steam Plant |
| Author | Denis A.S.Williams |
| Notes | Sketch of possible lay-out of automatically controlled friction gear, effect of centrifugal force on car, joint between wire and rail |