Alexanderplatz's position as a main transport and traffic hub continued to fuel its development. In addition to the three U-Bahn underground lines, long-distance trains and S-Bahn trains ran along the Platz's viaduct arches. Omnibuses, horse-drawn from 1877 and, after 1898, also electric-powered trams,</ref> ran out of Alexanderplatz in all directions in a star shape. The subway station was designed by Alfred Grenander and followed the color-coded order of subway stations, which began with green at Leipziger Platz and ran through to dark red.