Railroad signaling
"From the 1830s until today, the railroad industry has developed myriad complex mechanisms to help keep North America's railroad right-of-ways safe, efficient, and relatively accident-free. Now, for the first time, the otherwise arcane world of railroad signaling is explained in concise language and brought to life with nearly 200 fantastic photographs that help depict signaling history."--Page 4 of cover
Print Book, English, 2003
MBI Pub. Co., St. Paul, Minn., 2003