The basic difference is that Superfast trains have less stoppage & enjoy higher Average Speed and as far as Exp/Mail trains are concern, they have more stoppage with less Average speed.....
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But in the actual scenario, many times above conditions are not followed. ...
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Now,...
more... let's have the actual difference in the view of Commuters .... you need to pay extra SF charges if travelling in any SF trains whereas if travelling in Exp/Mail trains, you don't have to pay extra charge...
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Hope, described clearly..