| Year | 1970 |
| Date | 03-Jul |
| Volume | 136 |
| Issue | 3,396 |
| Page | 671 |
| Category | Locomotive |
| Part | |
| Title | Internal Resistance of Locomotives |
| Author | Gp. Cpt. J.N.C.Law |
| Notes | Reprinted from the Journal of the Stephenson Locomotive Society by kind permission of the Secretary |