century, desire for a mode of transit more swift and powerful than horses but without the disruptive effects of locomotives resulted in a number of systems being tried out. Experimental systems included overhead cable propulsion (with a cable clamp patented by P.G.T. Beauregard in 1869 later being adapted for the San Francisco cable car system), and several innovative designs by Dr. Emile Lamm, including ammonia engines, a "Chloride of Calcium Engine", and most successfully Lamm Fireless Engine which not only propelled pairs of cars along the line in the 1880s but was adopted by the street railways of Paris. While the city's first experiments with electric-powered cars were made in 1884 (in conjunction with the World Cotton Centennial World's Fair), electric streetcars were not considered sufficiently developed for widespread use until the following decade, and the line was electrified February 1, 1893. At the same time, it was extended from the corner of St. Charles and Carrollton Avenues out Carrollton to a new car barn at Willow Street. In 1900, the St. Charles and Tulane streetcar lines were extended on Carrollton Avenue and connected together, resulting in a two-way belt line. Cars signed St. Charles left Canal Street on Baronne Street to Howard Avenue to St. Charles Avenue, thence all the way to Carrollton and out that avenue, returning to the central business district on Tulane Avenue. Streetcars leaving Canal Street on Tulane Avenue were signed Tulane, operating out to Carrollton Avenue, then turning riverward to St. Charles Avenue, passing Lee Circle to Howard Avenue, and finally down Baronne (later Carondelet) to Canal Street. In 1922 the New Orleans & Carrollton Rail Road was merged into New Orleans Public Service Incorporated (NOPSI), which consolidated the city's various streetcar lines and electrical production. In 1950, plans were made to fill in the New Basin Canal, which the Belt Lines crossed on a bridge on Carrollton Avenue. The right of way was to be used for the Pontchartrain Expressway, and Carrollton Avenue traffic was to use an underpass. Rather than rebuild tracks in the underpass, the Tulane and St. Charles lines were separated, and Tulane Avenue was converted to a trolley coach line. During construction, the St. Charles line continued to operate (in both directions) all the way on Carrollton Avenue from St. Charles Avenue to the underpass construction site at Dixon Street. Once the underpass was completed, the St. Charles streetcar