Please note that you are posting on a 2 Rail forum and it looks like these will only be offered in 3-Rail only as there is only one part number given. It says that the 44-Tonner will have Kadee compatible coupler mounting pads, but no mention of even that on the SD40-2. Also, no mention if 2R conversion kits (scale wheels and stationary pilots) will be available for these models.
Scott