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...much more comfort though – the only difference is that the first class seats are padded, but the second class aren't - not much comfort when there’s standing room only. Read more about The world's busiest railway - Mumbai, India and rail. Find out more about The world's busiest railway 2015 - Mumbai Railway on TV. Explore more free learning from the Open University....

...Close tolerances are possible. Surface finish depends on the quality of finish on the dies. Parts made from new or repolished dies may have surface finishes of 0.6 µm. This high quality finish enables other coatings, such as chrome plating and painting, to be applied directly. See Also: Injection moulding, Acurad process, Pore-free die casting and Gravity die casting....

...free and with the minimum of distortion. Unlike conventional grinding there is no work hardening of the surface of the material. Poor operating conditions can lead to hydrogen pick-up in steels. Design: Low machining forces (0.5–1 MPa) make the process ideal for thin fragile workpieces. No burring of workpiece. Surface texture similar to that of a metallographic polish....