Railroad Electrification Question

[NW Mailing List]

 I have a question about railroad electrification that I am almost certain was never an issue on the Norfolk and Western or the Virginian (but was probably encountered on the Pennsylvania Rail Road).  Hopefully, some one will know the answer or can direct me a source.
How was power supplied to electric locomotives that crossed moveable bridges such as draw bridges, swing spans or lift bridges?
Bill KingArlington, Virginia  
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