. Electric railway journal . Double track, plain curve, angle 60 * LightLabor Trucking$ $ OrdinaryLabor Trucking$ $ CongestedLabor Trucking$ $ No. LightLabor Trucking$ $ Double track, plain curve, angle 90 deg.

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp