Vest pocket streamliner By Brian Schmidt | July 13, 2021 | Last updated on August 8, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Vest pocket streamliner Union Pacific’s original streamliner, the little M-10000 of February 1934, is at Chatsworth, Calif., on the Southern Pacific during its national tour. Gerald M. Best photo