Keywords: Mt Washington cog railway diesel locomotive.jpg en This Mt Washington cog railway diesel locomotive the first of its type uses a hydraulic pump and hydraulic motor to turn the cog wheel to climb the mountain On descent the cog hydraulic motor becomes a pump and the engine pump is reversed to pull the hydraulic fluid past an orifice in the line to allow the engine to pull the car down the mountain The orifice is opened completely when going up the mountain Own SayCheeeeeese 2008-07-25 Diesel locomotives of the United States Mount Washington Cog Railway Diesel rack locomotives |