Tea-vendors screaming chai, chai is a common sound on India's huge railway network. But now the vendors have been banned from selling their drinks in disposable plastic cups.
Instead all tea has to be served in a traditional clay cup, or kulhad. It's a government initiative to protect the livelihoods of the potters who produce them.
The railway predicts the intervention will create around 300,000 new jobs. Binu Alex climbed aboard to see how the ban was going down.