I bought three of the BNSF "Heritage" ES44AC's offered by MTH with scale wheels and fixed pilots. Hopefully I'll get the couplers installed and get them on the rails. Here are a few photos of #6022. They'll operate on AC or DC in conventional; DCS or DCC for command operation; and can run on 2-rail or 3-rail. The scale-wheel offerings will be hard to find. I'll dig up the part numbers for the ones I have.