Iron chain wheels pe lagaane ka koi fayda nahi.vo easly crush ho jaayega if a train is rolling on gradient.Iron wedges is better than it and inbuilt emergency brakes provided in wagons.Upar news me likha hai chain se trains ko baandhte hai.Now everything develops but they still living in 19th century
kewal itawa hi nahi, aisa Kanpur aur Unnao main bhi hota hai. wahan par Maalgaadi ke driver duty khatam hone par maalgaadi ke engine ko chain se patri se baandh dete hain aur pahiyon ke dono taraf wooden piece laga dete hain.
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