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There are 2 types of locomotives in sri lanka if we classify them by its power source as Diesel & Steam. Diesel locos can be divided to 3 categories as Diesel Electric, Diesel Hydraulic & Diesel Mechanical.
The pattern of which wheels are arranged is called Axle Arrangement. The pattern of the wheels fixed to a locomotive decides its weight, its purpose & the characteristics of the line which it can run on.
A locomotive is a heavy vehicle. It has a high inertia as well. Therefore a locomotive is not easy to start moving & it’s not easy to stop a moving train. There are different brake systems that function on different techniques.