From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Summary of mileage data for various cast iron engine units.
| Identifier | ExFiles\Box 111\2\ scan0437 | |
| Date | 12th January 1941 | |
| 800 12.1.41. CAST IRON ENGINE MILEAGES B.80 UNITS 30 C VII - 63,084 Mls. 33 C VII - 15,951 Mls. 11 B V - 21,734 Mls. 4 B 50 - 15,106 Total 114,875 Mls. B.60 UNITS 9 B V - 11,656 Mls. 1 B 80 - 10,451 Mls. 3 B 50 - 27,729 Total 49,836 Mls. B.80 + B.60 total = 164,711 Mls. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||