AFE 16475, Helena, Montana, 1921. Changing and Rearranging Interlocking Plant on Account of Double Track Operation by N.P. Railway. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Cost: $1200. Series II. Lines West. Other Subject Categories: Crossings, Interlocking Plants
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LC Name Authority: https://lccn.loc.gov/n80007662