Alto interlocking tower at the west end of Altoona, PA

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The mighty Pennsylvania Railroad completed a line over the Allegheny Mountains between Altoona and Pittsburgh in 1854. This route included the famous Horseshoe Curve on the eastern slope. Its most famous passenger train was the Broadway Limited. It wasn't named for Broadway in New York City, but for its broadway, a four track mainline.

Alto interlocking tower at the west end of Altoona, PA

Extra 8132 East is dropping down off the mountain and easing passed Alto interlocking tower into the yard at Altoona, PA early in the morning on September 6, 1976. The New York Central and Pennsylvania Railroad were combined in February 1968 to form the Penn Central. Conrail has just taken over and Penn Central and Erie Lackawanna engines were mixing freely. Alto Tower is at milepost 236.7. Disk 120