Lego City train track compatible

V2 here : [Lego City train track compatible V2](http://www.thingiverse.com/thing:2184907)

I've found the awesome job of barspin ( Lego Train Track, Straight ).

but i was looking a heavily customisable one (I love openscad for this), faster printing, with less material.

i've done this it one, not as beautiful as barspin, but it just works.

the 120mm is the standard size.