frequently taller than standard pylons. They may have marking lamps, and unlike standard pylons, often have stairways for easy access to the top. In many cases, their height makes them ideal for carrying radio antennas and transmitting equipment. Crossing pylons for valleys, depending on the local topography, are not necessarily tall, but the distance between the conducting cables must be sufficient to prevent high winds knocking the conductors into one another; these pylons have wide crossbars to prevent this. For very long spans each phase has a separate pylon, particularly if the pylons are short. Special crossing pylons are often used where aerial tramways cross power lines. These pylons are designed with integral scaffolding so that the tramway cars can be reached without touching a live power line. This enables passengers to be rescued from the tramway if it fails without cutting the power from the power line. Such installations can be found, for example, south of Zermatt, Switzerland; at the Patscherkofelbahn near Innsbruck, Austria; and at the Penkenbahn in Mayrhofen, Austria. See also List of spans References This article draws heavily on the corresponding article in the German-language Wikipedia. Electric power infrastructure Spans (architecture)