| Year | 2004 |
| Date | 24-Dec |
| Volume | 193 |
| Issue | 4,237 |
| Page | 734 |
| Category | Electrical |
| Part | 2 |
| Title | Electro-Pneumatic Contactors |
| Author | Colin Beckwith |
| Notes | Discusses the reasons for the scale chosen. Traction motors, first solenoid valve, first EP contactor, scale factor, production contactor, compressed air supply, overview of contactor operation |