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Adam Lucke's Highway Engineering Blog: Rail Crossings
Railway Bob's Module Building Tips: March 2012
FHWA - Railroad-Highway Grade Crossing Handbook - 4 Identification of
Details West grade crossing wiring | Model Railroad Hobbyist magazine
TY'S MODEL RAILROAD: Wiring Diagrams
TY'S MODEL RAILROAD: Wiring Diagrams
Railway Investigation Report R08T0158 - Transportation Safety Board of