Eventually, transit officials hope the entire system will be converted, although that could take decades.

The system was converted to third rail in 1918 (see above).

The new name would become the single brand for all branches, products and operations worldwide when the systems are converted in 1997.

On June 22, 1880, the entire system was converted to standard gauge.

The entire electric system was converted to diesel buses over a period of less than one month in September 1963.

On 22 April 1940, the electrical system was partially converted.

About thirty systems were converted and installed on military bases.

The entire system was converted to general use in 1992.

Between 1937 and 1945 the system was converted to trolleybus operation.

The systems were then converted for the use of organic gardening.