by BuddR32
This is a question for the old hats that worked in the car shops.
DC Propulsion cars were (for the most part) either GE or Westinghouse.
DC traction motors with series-parallel switching and a cam driven controller & resistor grids.
Specifically GEs system. They called the 1960's onward systems SCM-##. SCM meaning Static Cam Magnetic. I never quite knew what was meant by 'static' but, CAM to mean the camshaft driven switching gear, and magnetic, the magnetic contactors.
LIRR/MNR M1/M3s have the same family of system.
Read recently that some model of cars (Maybe R30) had a newer solid state SCM system, as opposed to GE's earlier MCM system.
Here's my question, assuming MCM is M(something)-CAM-MAGNETIC.
What was the 'M' CAM system, if SCM is solid state? Did it use vacuum tubes? Something else?
DC Propulsion cars were (for the most part) either GE or Westinghouse.
DC traction motors with series-parallel switching and a cam driven controller & resistor grids.
Specifically GEs system. They called the 1960's onward systems SCM-##. SCM meaning Static Cam Magnetic. I never quite knew what was meant by 'static' but, CAM to mean the camshaft driven switching gear, and magnetic, the magnetic contactors.
LIRR/MNR M1/M3s have the same family of system.
Read recently that some model of cars (Maybe R30) had a newer solid state SCM system, as opposed to GE's earlier MCM system.
Here's my question, assuming MCM is M(something)-CAM-MAGNETIC.
What was the 'M' CAM system, if SCM is solid state? Did it use vacuum tubes? Something else?