draft amendment of the technical regulations for the railroad constituents 145 pages available in korean background on the technical regulations for railroad constituentsregarding railroad constituents notified by the ministry of land infrastructure and transport molit the manufacturer or his representative shall get type approval from molit for the newly-designed railroad constituents or remarkably modified constituents. also manufacturer shall obtain manufacturer approval from molit to enter into mass production for the type approved constituents railroad safety act article 27 and 27-2 .type approval is granted to the design for notified constituents that meets technical and safety requirements of the technical regulations.manufacturer approval is production approval for the type approved constituents that the manufacturer can meet quality management requirements of the technical regulations. molit has enacted the technical regulations for the examination of type approval and manufacturer approval of 10 notified constituents in 2016 which were wheel axle coupler rail glued insulated rail pre-stressed concrete sleeper electronic interlocking system af audio frequency track circuit automatic block system and contact wire.molit has enacted the technical regulations for the examination of type approval and manufacturer approval of 6 notified constituents in 2017 which were wheel slide protection device brake pad brake cylinder unit brake disk tensioning device and composite insulator. amendment of the technical regulations for railroad constituentsmolit plans to amend the technical regulations of wheels axles and coupler used for special purpose rolling stocks to be suspended until december 31 2020.-special purpose rolling stocks built for special purposes such as maintenance of railway facilities or accident restoration of rolling stocksmolit also add a new constituent for type approval roll spring type tensioning device.molit plans to amend the technical regulations of tensioning device for roll spring type device.