Got these shells about a year ago. Just now starting to mount them to the Athearn chassis I have in the parts drawer. Why the Athearn? so it will run with all the other locos I have till the DCC thing happens here (playing lotto to win money for same). After adding the nose lights as explained in this thread http://www.frisco.org/vb/showthread.php?1568-Nose-Gyralights&highlight=nose+lights Did some cosmetic work on the noses and now am doing some more work to the shells adding details and such. These Atlas shells have the thinner handrails with the radiator fans spaced apart a little more than the Athearn shell has, and a split radiator screen. One of the shells is numbered SLSF 636. It is getting renumbered, the other 2 shells came un-numbered. After some research I chose 662, 650, 648. Are these correct numbers for these shells? Need to make sure before decaling. Paint is Model Master (MM) Sunburst Orange, MM flat White (covers so much better than gloss) and MM Aluminum for horn and nose Gyra light on one loco. The research I have done shows the horn and Gyra light was at one time silver in color on 648, a picture I have shows the unit pretty dirty, they most likely both had been replaced at some point. Parts used so far include, 1/4" H beam for nose box and DA 1001 Gyra light, DA 1802 antenna, DW 106 beacon, DW 242 air tank piping, DW 204 air tanks, DW 191 horn, DW 139 air dryers, and .019 brass wire for piping I'm sure I forgot something.