0 will be for special trains, 3 for Kolkata locals, 4 for Secunderabad, 9 for Mumbai suburban locals, and 1 is for all mail and express trains. What is all this about?
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Indian Railways is introducing five-digit train codes from December. This refers to the new prefix digit for different types of trains.
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Participants at this year's Chakravyuuh will recall that a related question was asked in the finals.