At Amsterdam Zuid it switches from third rail to pantograph and catenary wires. Some have two platforms connected through a footbridge above the overhead catenary system. Philadelphia's SEPTA Regional Rail uses exclusively electric power, supplied by overhead catenary wire. The trainsets are powered by 1.5 kV or 25 kV AC catenary. Hz single phase and supplied via an overhead catenary. The catenary arch was built without centring. Hz overhead catenary, the standard of NH and PRR. The Rice House has catenary arches. This hyperbolic cosine function describes the shape of a catenary. The catenary produced by gravity provides an advantage to heavy anchor rodes. Power will come from an overhead catenary system. In 1918 the electrified (2400 V DC catenary), double-track tunnel was dubbed Montreal's first subway. A catenary bridge has the form of a catenary arch. It is not a pure inverted catenary. Igloos are designed with a catenary arch cross-section.