Application Documentation Easy to use Engineer's Cab for NCE DCC systems. One of NCE's most popular engineer cabs Cab 04p Manual Features Single button operation of all decoder functions Easy selection of locos/consists Momentary HORN button Uses a conventional knob for speed control. Selection and control of individual or entire routes through turnouts (via the MACRO key) OPTION button that can be programmed to act as any button you wish, even those found on a much larger cab Can be set to YARD mode. Yard mode makes the speed knob act as a "center off" speed control. Turn the knob to the right and the loco will increase speed in the forward direction. Turn it to the left and speed will decrease until it gets to zero then it will start to increase speed in the reverse direction the farther you turn it to the left.