I just received my Aristocraft Great Northern Big Sky Blue SD45 today and let me just say it IS FANTASTIC! WOW factor is 10 for me. The SD45 is the locomotive and it's introduction that I first considered Aristocraft to be getting serious about model trains. This new unit just screams impressive. I wish they had done multiple units. Even still, it looks awesome leading a pair of B & M GP40's. Can't wait to PLAY!