Original sentence: The Research Design and Standards Organization (RDSO) is a ISO 9001 organization under the Ministry of Railways of India, which functions as a technical adviser and consultant to the Railway Board, the Zonal Railways, the Railway Production Units, RITES and IRCON International in respect of design and standardization of railway equipment and problems related to railway construction, operation and maintenance.The status of RDSO was changed from an "Attached Office" to a "Zonal Railway" on April 1, 2003
Edited sentence: The Research Design and Standards Organization (RDSO) is a ISO 9001 research and development organization under the Ministry of Railways of India, which functions as a technical adviser and consultant to the Railway Board, the Zonal Railways, the Railway Production Units, RITES and IRCON International in respect of design and standardization of railway equipment and problems related to railway construction, operation and maintenance.The status of RDSO was changed from an "Attached Office" to a "Zonal Railway" on April 1, 2003, to give it greater flexibility and a boost to the research and development activities