09/05/2014 13:04 Dankuni Junction. 12273 Howrah - New Delhi bi-weekly Duronto (Non AC) Express suddenly speeds past Dankuni, without any prior warning, at its Max Permissible Speed... Loco - Howrah WAP4 22405 , ex- Asansol WAP6. The train covers 1451 Km in 17 hours, maintaining an average speed of 86 Km/H. Although slower than Howrah Rajdani, it is the fastest non AC train of Indian Railways..