New Delhi, Jan 31 (ANI): Political leaders on Saturday react even as Northern Railway CPRO Neeraj Sharma said that the 'chai pe charcha' cups on board Shatabdi Express with pictures of Prime Minister Narendra Modi and BJP President Amit Shah on them, was a mistake. He said that the Railways is enquiring on the issue and that the cups got mixed up with the other stock unknowingly. BJP leader Shahnawaz Hussain said that the cups may have been brought by BJP fans and that the Railway department is not involved in the same. Meanwhile, congress leader Abhishek Manu Singhvi said that if this is true, its shameful and insulting to an independent institution of the nation.