ट्रेन Blue (नीले) रंग का ही ज्यादातर क्यों होता है ? Why Trains are Mostly Blue in Color? TEF Ep 31

Do you know why trains are mostly blue in color? Actually technology of the braking system is the answer. To differentiate both the technologies, blue colour is used for the new trains. This is the episode 31 of the Top Enigmatic Facts (TEF) series.

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