One of my earliest memories of working for the Missouri Pacific railroad was being on call for temporary vacancies that occur when a regular crew member takes a day off. I was living at home and my dad took the call for me. He relayed to me that I was assigned to the ATSF transfer for the afternoon shift. He then asked me just what exactly does that mean? Not knowing much about my duties having just hired out I told him "I guess I am on my way to New Mexico."