Beech raste train ki maximum speed me aisi gatnaye hui to kuchh bhi ho sakta hai, traino ke rako ke coupling par bhi itna hi dhyan diya jana chahiye, jitna unke wheels ya breaking system par diya jata hai , anuman coupling par tab tak koi dhyan nahi deta jab tak unhe lock-unlock ki jarurat na pade, aur aise haal me mahino tak coupling ram-bharose unchhuhe rehte hai aur traine apna safar jari rakhti hai....