The modular nature of the Citaro meant that production orders for both SBS Transit and SMRT Buses were rolled out from the same factory and to a degree share common features, such as the bodywork and the driver's dashboard. These buses utilize BlueTec 5, the selective catalytic reduction (SCR) technology by Mercedes-Benz requiring the use of AdBlue, to meet the Euro V emission standards.
SBS Transit units also received the OM906hLA engine (6,374cc), but opted for the Voith D854.5 4-gear automatic transmission and Lawo HighLED EDS (with Luminator USA ODK 4, predecessor of Lawo TOUCH-Control). The interior is fully low-floor and its air-conditioning was supplied by Konvekta. Both operators have also customized their interior fixtures to a certain extent in order to blend in with their existing WAB fleet and corporate identity.
Batch 1 Citaros are registered SBS6000L to SBS6285G, with certain omissions.