13 Plarail mini bridge piers & 10 New Block bridge piers (1 green) You can build single-track elevated tracks, and stack them in multiple layers. Stacking 4 mini bridge piers will be the same height as a block bridge pier. Thank you for viewing. My child, who loves Plarail, enjoyed building tall elevated tracks and using them in various ways. There are no visible stains, and they have been disinfected with alcohol. These items are still in good condition and can be enjoyed for a long time.