Track needs regular maintenance to remain in good order, especially when high-speed trains are involved. Inadequate maintenance may lead to a "slow order" (North American terminology, or Temporary speed restriction in the United Kingdom) being imposed to avoid accidents (see Slow zone). Track maintenance was at one time hard manual labour, requiring teams of labourers, or trackmen (US: gandy dancers; UK: platelayers; Australia: fettlers), who used lining bars to correct irregularities in horizontal alignment (line) of the track, and tamping and jacks to correct vertical irregularities (surface). Currently, maintenance is facilitated by a variety of specialised machines.
Jinzhou Tiegong has reseraching and developing a series of equipment to solve all the matters of rail surface.
NGM-4.8 rail profile grinding machine
For grinding of rail head, running and side surfaces, also grinding weld joints and after build-up welding.
GM-2.2 electrical rail profile grinding machine
Electrical rail grinding machine for grinding of rail head, running and side surfaces, also grinding weld joints and after build-up welding.
SNGM-180 portable rail grinding machine
Universal right-angle rail grinding machine with 2 stroke gasoline engine, 7kg lightweight for site-independent use. For grinding, derusting, polishing and deburring rails and frog, and also work for signal engineering.
NCM-4II rail switch grinding machine
For grinding fat edges of point rail, frog nose rail, wing rail, also can grind the top surface and fat edges of all kinds of rails.
DGM-2.2I/DGM-2.2II multi-functional rail switch grinding machine
For grinding rail top surface and fat edges of crossing frog, point rail, frog nose rail, wing rail. Small size and low power consumption.
NXG-4 rail deruster
For derusting and grinding of all kinds of rail top surface with wire brush to overcome the defective shunting of track.