In recent few years, we have seen the Bollywood industry have come up with some unique concepts and ideas of movie promotions. And the latest, we see Emraan Hashmi-Vidya Balan's upcoming movie Ghanchakkar, that will be soon promoted in the local trains. Mumbai local trains play a vital role in the film, so "when promotion strategies were being discussed, promotions on train was considered an important idea". "Emraan and Vidya are set to promote the film on the local trains in four cities including Mumbai, Delhi, Indore and Lucknow," the source added. Last year, Vidya Balan was spotted promoting her movie Kahaani in a BEST bus. Surprisingly, the actress was seen in her pregnant avatar during the promotions. Directed by Rajkumar Gupta, Ghanchakkar is all set to release on June 21. Watch the trailer..