These individual modules control independent functions of an EMD 38-2 engine and are known as "the brains" to those that work inside the cab.
SB11 is the sensor bypass, RC11 the locomotive rate control module, TH14- the throttle response control and VR14, the locomotives voltage regulator.
Do you ever wonder what is inside a locomotive, and how they run. Check out these photos from the shops to see locomotives taken apart to be repaired or rebuilt. It is cool to be able to see the hearts and organs of these steel horses.
