AMD-103 lighting characteristics

Viewing several photos of the AMD-103[P42ABC…family of locomotives] that Amtrak operate appear to have many different lighting characteristics. Does anyone know what lights function on these locomotives & their individual characteristics??? For instance, the front/rear headlights can operate in any of three(3) states; white, red or blank/off depending upon operations. Anyone know what links I could reference to learn more about these locomotives & their lighting functions/characteristics. Thank You in advance for any information that you can provide.

Respectively,

Robert[Bob] E. Cronan