Rail passengers travelling in Shatabdi, Rajdhani and Duranto trains will experience a comfortable ride without jerks as the country’s first jerk free Duranto train is ready to roll out of the Rail Coach factory within next four days. The factory has also developed biological toilets to keep the railway tracks clean and the first rake of coaches fitted with new design of biological toilets was running successfully on Gwalior-Varanasi section in these days. This was disclosed in Kapurthala today by General Manager of the factory Pardeep Kumar.