Yes Even I like thed Go Kerala livery on TVC Rajdhani...It highlighted the Malayalam culture and promoted tourism. But Such KVB, Pataka Chai, etc. are very bad. Over a period of time, the trains are known from advertisements' name only
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Examples:
1. MLDT-PNBE Exp - Pataka Chai Express
2....
more... Even Chennai Rajdhani was not spared, it was called "BSNL Chennai Rajdhani"