Why are only 5 digit codes written on train coaches what is the meaning of these numbers?

Why are only 5 digit codes written on train coaches what is the meaning of these numbers?

Indian Railways is the fourth largest rail network in the world. Every day millions of people travel from one city to another through Indian Railways. During the journey, you must have noticed that the train number has a 5 digit train number. It is through these numbers that passengers identify their trains and also search for them online. A 5 digit number is also written on every train coach. But do you know why there is a 5 digit code on every coach of the train and what does it…

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