of four matching double-sided motor cars and control trailers, to a design derived from that of the Forchbahn cars. These built by SWS, whilst two further motor cars were added in 1988 with bodies built by Schindler Waggon and trucks by SIG. In 1985, delivery of a second batch of VBZ trams commenced. As SWS was no longer trading, the mechanical part was supplied by Schindler Waggon. Of this batch, 53 were similar to the standard model delivered earlier, whilst a further 20 were non-articulated cars designated Be 2/4. Similarly to the 15 non-driving units of the earlier batch, these units have no driving cab and are only suitable for use in coupled pairs. This type was specially designed to permit optimal use to be made of the platform length of certain stops where platform extensions were not acceptable. Delivery of the second batch lasted until 1987. In 1987 and 1988, a fleet of nine Be4/8 double-ended double-articulated cars were built by SWP / SIG / ABB for Regionalverkehr Bern-Solothurn (RBS) for use on the RBS suburban tramway to Worb. For the opening of the Genoa Metro in 1990, a fleet of six Be 4/6 standard gauge double-ended single-articulated cars were built to the Tram 2000 design. Unlike their counterparts on Swiss tramways, these high-floor cars operate on segregated right of way and serve stations with matching high platforms. The third and final batch of VBZ trams was delivered in 1991-1992. This comprised a further 23 standard articulated units and a further 15 non-articulated non-driving units. In contrast to the earlier batches, these trams have three-phase AC motors. Despite electrical differences between the batches, all VBZ Tram 2000 units can be combined in pairs for multiple unit operation. A second batch of eight Forchbahn vehicles was delivered in 1994 and were to be the last trams to be built to the Tram 2000 design. Like their predecessors, these cars are non-articulated vehicles with a cab at one end but doors on both sides, intended to operate back to back. However they are not permanently coupled, and are therefore classified Be 4/4. In the early 2000s, VBZ decided to rebuild some older trams with low floor sections and, as a prototype, a Tram 2000 centre section was built by VBZ's own workshops largely using stock parts. This section was inserted into 2113 in 2001 and underwent extensive tests. Following the successful