A Control stand is a diesel-electric locomotive subsystem which integrates engine functional controls and brake functional controls, whereby all functional controls are "at hand" (generally, within the operational radius of the locomotive engineer's left forearm from his customary seating position, facing forward at all times). The early control stands were designed to AAR standards. The traditional AAR control stand is still preferred by some railroads. Current control stands may employ multiple displays and electronic actuation of operational controls from an all-electronic desktop.