Modern railroading By Angela Cotey | March 20, 2020 | Last updated on December 29, 2020 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates A refrigerator car rolls into the bowl of Union Pacific’s North Platte, Nebr., hump yard. The box to the right contains a radar speed-monitoring device. Union Pacific photo