New Delhi, Mar 10: In a major technology development, the Rail Coach Factory (RCF), Kapurthala, a production unit of Indian Railways, has developed the design for high speed metre gauge non-airconditioned coaches for export. A number of enquiries have been pouring in for export of metre gauge stock with a speed potential of 130 km per hour. At present the speed of metre gauge coaches on Indian railways is limited to 75 km per hour. The design of high speed metre gauge coaches had been sent to Research, Designs and Standard Organisation (RDSO), a Research and Development unit of Indian Railways, for approval, the railway sources said here today. Bureau Report