GUWAHATI, September 8: Coal India Limited (CIL) today signed an agreement with the representatives of the All Guwahati Students Union (AGSU) saying that it will not shift the head offices of its subsidiary Eastern India Coalfields from Guwahati to Calcutta as earlier decided by the authorities. Nirmal Baishya, president of AGSU said students gheraoed the authorities at their head office at Christianbasti following which the deal was signed.