It Was Made Optional For Limited Period. The project was to start on a pilot basis for 45 days from June 15. The four premium pairs of trains where the trial was to be conducted were Nizamuddin-Mumbai Central (12953-12954) August Kranti Rajdhani, New Delhi-Patna Rajdhani (12309-12310), Pune-Secunderabad Shatabdi Express (12025-26) and Howrah-Puri Shatabdi Express (12277-12278).