This issue comes days after the railways was found in violation of the poll code for issuing tickets with PM Modi's pictures on them.
The EC is learnt to have invoked the 'party in power' clause of the poll code in the case as it could be averred that party in power' is using government transporter for election publicity.
The poll panel has issued a notice to the railways, asking it to submit a report by Thursday on the slogan on tea cups, so that it can take a call on whether it was a poll code violation.
The Railways has also reduced flexi-fares from 1.5 to 1.4 times the base ticket fare in 101 trains