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Rebuilt and re-opened for tourists in 2003. Uses the Abt rack system. 1,067 mm (3 ft 6 in) gauge. Mt Morgan Rack Railway on Mount Morgan – rack system existed until 1952 when the line was deviated. Used the Abt rack system. 1,067 mm (3 ft 6 in) gauge. Ellalong Colliery – underground Lamella rack – installed in 1984
A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
The Pilatus Railway is the steepest rack railway in the world, with a maximum gradient of 48% and an average gradient of 35%. Functioning of the rack and pinion on the Strub system. A rack railway (also rack-and-pinion railway, cog railway, or cogwheel railway) is a steep grade railway with a toothed rack rail, usually between the running rails.
The 11.2 km pass segment, between Yokokawa Station on the Gunma side and Karuizawa Station on the Nagano side, had been operated with the rack-and-pinion railway system until 1963 when the line was rebuilt and new locomotives for non-rack operation were introduced.
The average gradient in this rack section is 1 in 24.5 (4.08%), with a maximum of 1 in 12 (8.33%). Southern Railway carries out the majority of the locomotive repairs at the Coonoor shed but has rebuilt many of the steam locomotives at the Golden Rock Railway Workshops. Many carriage repairs take place at Mettupalayam.
The Nilgiri is the only rack railway in India, and it uses an Abt rack system. The ABT system requires the use of special steam locomotives. The line contains 208 curves, 16 tunnels, and 250 bridges, causing the uphill journey along the route to take about 290 min (4.8 h), while the downhill journey takes 215 min (3.6 h).
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