the option of a 4-speed Allison AT545 gearbox. In 2005 a hybrid Solo was constructed, using a small diesel unit and an Eneco (now known as Traction Technology) battery propulsion unit.

The Switch Solo is available in various lengths: 7.8 m, 8.5 m, 9.2 m and 9.9 m - all 2.5 m wide. The chassis type code of the Solo denotes the length - M780 corresponds to 7.8m, M850 to 8.5m, and so forth. However, the Cummins-powered Solos required extra rear bodywork in order to accommodate the larger engine, which increased the overall length by 0.3