Trains Go Through Here The single-track tunnel portal from NOCH is an ideal addition for H0 (1:87) scale model railroad layouts and enables realistic tunnel or mountain entrances. Made of sturdy injection-molded plastic, this portal is robust and easy to install. The set contains two portals, each measuring 11 x 11 cm, which are perfect for building single-track lines. The portal is also suitable for overhead lines and can therefore be used in a variety of ways. Note: The tunnel portal is suitable for overhead contact line.