@jacqueslees: Metro Line Component Baseplate (Baseplate for Metro Line Track Fittings) The DT series fastening systems are rail fastenings specifically designed for underground lines of urban rail transit. They are available in a range of models, including DT I, DT II, DT III, DT IV, DT VI and DT VII, and each model is further subdivided into different improved variants. For example, DT III-2 is an improved version of the DT III fastening. DT series fastenings are extensively used in the underground monolithic (integral) track beds of urban rail transit. Ferritic ductile iron, by virtue of its strong resistance to vibration and impact, is used in the manufacture of track components (track fittings) such as metro line component baseplates, rapid transit baseplates, special-shaped (profiled) embedded iron shoulders, and baseplates for passenger dedicated lines (PDL), etc.

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