SPSF posted:MTH hasn't yet made a SD45 in Southern Pacific
They have made SD45 in Union Pacific "Scaleking" and Premier Powered & Dummy (I would avoid the early undersized railking model).
EDIT: The Early Premier which later became "Scaleking" was the only version available in Conventional, Horn only or PS1.
Thanks for this! Do you happen to know the MTH model number? I haven't been able to sleuth it down.