Although sleeper class hatane ka idea bekaar hai I totally agree but safety at 160kph ka to wo bhi dhyan rakhenge hi. Agar bina safety hi karna hota to abhi hi LHBs ko 160 pe kar dete.
Waha bhi Railway engineers baithe hai, itna to risks, technical analysis wo karenge hi aur full safety assurance ke baad hi speed upgrade hona.