changed all step treads to $alphatest

(finally) added acrylic skins to brakewheel, cab signal box

added pyle national MU plug by laz

added new gauge textures for lima locomotives and others

added battery gauges and more air gauges by titus

added speedometers by titus

oops i fucked up the VMTs for the new arc load meters

added more vintage load meters by titus

added even more loadmeters by titus

added new air gauges by titus, updated color palette of all new load meters