This is a model maglev train I designed for my science fair project. It is modular so you can make it as long as you like. You can print as many middle sections of the track as you want but you only need two ends. 

You'll need 60x10x3 mm Neodymium magnets for the track and 15mm(diameter)x2mm(thick) round Neodymium magnets for the car.