While I don't need any SW1500 (in fact I need the S switchers more) I can definitely see the marketing appeal for a manufacturer. Based purely on observation, I see N scale as being ripe for such a loco that can fit well within contemporary railroading and still be attractive as the new model on a 60s-ish layout. Again based purely on observation, I think that's the era sweet spot for N, given the demographics versus the older HO modeler demographics.