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Category : Interlocking towers of the Pennsylvania Railroad
PRR Architectural Drawings | Commonwealth of Pennsylvania - PA.GOV
Dave's Page of Towers - John Haynes
PRR Interlocking Towers - RAILROAD.NET
Interlocking Towers - UPDATED 08/20/24
Pennsylvania Railroad - Wikipedia
Interlocking Towers A Lost World - The Trackside Photographer
State Interlocking — Michael Froio | Photography
Radnor Tower (Tower “R”), ca. 1890 – Radnor Historical Society
Lemoyne Junction Follow-Up — Michael Froio | Photography