THE PEDRAIL--A NEW TYPE OF ROAD LOCOMOTIVE. A Marconi Plant for International Use. MODEL SHOWING THE PEDRAIL ASCENDING A STAIRWAY. THE PRINCIPLE OF THE PEDRAIL'S OPERATION. DIPLOCK TRACTION ENGINE FITTED WITH PEDRAILS. ALL FOUR WHEELS ARE DRIVERS. A PEDRAIL TRACTION ENGINE SURMOUNTING AN OBSTACLE., scientific american, 1903-04-18
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