This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 Realistic Rail Track ... Extend rails and add as many sleepers as you want... they are all in the components... Size of model... less than 1 mb... Why not checkout and join my Sketchup8 ... Forum8 %26 Gallery8 on the Website below...