How Indian Railways' five-digit train numbers work

hindustantimes.com

In 2010, Indian Railways replaced its four-digit train numbering with a five-digit system to improve identification and standardize tracking across software applications. The first digit denotes train type (e.g., 1 for long-distance express/mail, 0 for special holiday trains), the second and third indicate zone and destination, and the last two are a unique serial number. Previous four-digit "Universal Numbers" were not unique across zones. Existing trains received a "1" prefix; special trains got "0," helping streamline management of India's vast rail network.


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How Indian Railways' five-digit train numbers work | News Minimalist