Gearing up for the GST roll-out from from July 1, the Railways has appointed nodal officer in each state to ensure smooth transition into the new single tax regime.A consultant has been appointed for examining the impact of the GST in the Indian Railways, the official said.Since GST registration is based on PAN details, Railways has already got its PAN.The General Manager of each zone has been nominated as the Principal Officer for taking care of GST compliance.