About this 3D model

This is Sleepers you can use outdoor with aluminium or wood rails (still testing with wood).I have noticed that the rails on my old designs are sagging a little if it is to hot in the sun or if you are using live steam loco. The aluminium flat bar i am using in the pictures are 3 x 15 mm.My next big release will be a bigger loco than my old one, but because my old 3d design software stopped working i lost around 60% of my work. and i am forced to redesigning a lot in my new software, im now using Shapr3d . if you have a ipad pro and a pen i can highly recommend this software