MDEL900 Straddle Carriers has single main girder and single gantry with rated lifting weight of 900ton. It is designed for the double line fabricated box girder with the length of 32m, 24m and 21m used in railway passenger line to be lifted and transported horizontally and vertically in fabricating yard, meanwhile, it also can load the concrete girder onto the girder carrier in the loading area of fabricating yard.