Silent sentinels Railroad pole and code lines are getting more rare, but Union Pacific's right-of-way up Peru Hill west of Green River, Wyoming still has the silent sentinels lining the way, as seen at dawn on March 13, 2012.
Photos showing the railroad pole lines. The pole line used four basic electrical circuits - telegraph, telephone, signaling, and power. Modern technologies of fiber optics, microwave, radio, satellite, and computers have been replacing the pole lines.
