The powerful oil-fired locomotives now propels up to 6 compartments as compared to 4 by the coal-fired one as it carries out the daily assault on the 'Queen of the Hills' at a faster and maintenance free pace with an environmentally friendlier technology. With all other efforts by the Southern Railways, such as replacement of the aging locos with new fleet, electrification etc., being shelved out for various reasons, the successful yet cost effective conversion to an oil-fired system has ensured that the vast tourist populace comprising international and domestic tourists who throng the popular hill retreat shall continue to experience the ecstasy of an exhilarating ride while adding to the railway exchequer.