In September 2010, SBS Transit announced the purchase of 300 Citaro units while SMB136C was still on its one-year trial. The SBS Transit Citaros first began revenue service on Route 28 on 1 June 2011, and they now represent the spiritual replacement of the older O405s which were fully retired just days before. 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. SBS Transit units also received the 6374cc OM906hLA engine, but opted for the Voith DIWA 854.5 4-gear automatic transmission and Lawo HighLED EDS (with Luminator USA ODK 4). 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.
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