HO scale model of the cab and nose of EMD 5, 6 and 7 GP60 demonstrator units as modified for service on CSX (class lights are blanked and gyralight is removed). Use with Cannon & Company cab and nose kits to detail the model with door locks, sliding windows, headlight, handbrake, sand filler hatch and sand valve access doors (let's face it: you just can't improve upon those parts, so there's no point wasting money printing them).
Unless you're starting out with one of the Fox Valley models with the early dynamic brake hatch, you'll need to replace the dynamic hatch with this one:
http://shpws.me/ONAG
Clean the parts to remove support wax from the printing process. Carefully trim each part from the "sprue" and assemble using CA glue.