Indian railways has the fourth largest network in the world. Short or medium distance travel by air causes considerable pollution per passenger. As an alternative objective of reducing environment pollution, superfast train option is studied. As a first step, speeding up of trains with existing infrastructure and same rail tracks is explored. The distance of 200 km between New Delhi and Agra cantonment is be covered in 105minutes with an average speed of 160 kmph. A 3D model of complete train is developed in VI Rail and results are compared with measured data obtained from Research Design and Standards Organization (RDSO) of Indian Railways. Present study analyzes translatory motion in terms of lateral and vertical accelerations which depend on primary and secondary suspension. The values of primary and secondary suspensions are changed in the 12th car body, 6th car body and 1st car body to study the derailment. The critical speed at which Gatimaan Express model can be derailed, is determined.
