Kuchh chezon par mai dhyaan lana chahta hun, Causes of derailment.
1) Packing of tracks...Without proper packing trains ate running at 130kmph in some sections like pnbe-ddu...i am a electrical engineer by degree and technisian in railway signal department as profession. Mai koi baklol aadmi nahi hun..besak mai signal me hun par railway ke sabhi department ki achhi khassi jankari rakhta hun..
Train heavely shakes in up line between ara-bxr ..i was travelling from 13201 in newly build 3ac coach..Coach shakes heavily, i was unable to sleep even i like sleeping in trains...2,3...
more...

times jerk near Twininganj is so bad that i was thrown off my side lower seat..i know very well the difference between jerk and floating of coaches.. floating do not cause derailment but jerk can...i bet sone serious accident is waiting in pnbe-ddu if packing not done.
2) Bad bogies of freight trains especially boxn..i always watch the bogies and axles of freights carefully when it passes from me..i have seen heavily shaking axles irrespective of calm bogies...there is horizontal motion between bogie and axles, which should not be there...vertical motion is ok but not horizontal... horizontal motion represent faulty or heavily worn roller bearings...approx 20 out of 60 coaches in every boxn freight are bad, that is only surving due to wheel flange and good tracks or who knows that god is protecting...i have even seen parallel race of freight with my 13202 for about 10km...looked every faulty axles, thats insane...it can derail someday somwhere.
3) Irresponsible Officers...as we know railway is facing super lack of staff..Staffs are there in every department but numbers are only sufficient to do maintenance only nothing else..you expect them to do special work 3 days a week and think that it has no any effect on maintenance then you have no brain...these days are so hot, that you cannot work for 3,4 hours continuously in sun..you think that they will cut grass in station or block section and after 4 hours they will do maintenance of tracks, then you are wrong...we are not machines....these days i have seen 50's of group D staffs are busy in cutting grass daily..due to huge moist environment, grass came back again in 7-10 days...then again they start cutting. Instead of this you should have provided herbicide and spray machine and depute only 3,4 staff...they will do work of 50 people easily...grass will not come back again for 30 days minimum.
4) work load and duty period....Simple human are not machines... machine can even fail after proper maintenance then human can also fail...sone human failure led to disaster like SPAD.