of the 2000s, Thomas began to introduce its most extensive updates to its product lines since the 1970s. For 2001, the Saf-T-Liner HD was introduced (combining the Saf-T-Liner ER, WestCoastER, and the MVP ER). Distinguished by its large mirror housings (integrating sideview, convex, and crossview mirrors into a single assembly), the HD also visibly shared several components from Freightliner, including its instrument cluster and headlamps. For 2003, Freightliner became the sole chassis supplier for the Saf-T-Liner Conventional, with all Conventionals becoming Saf-T-Liner FS-65s. In 2004, Thomas renamed the HD the Saf-T-Liner HDX. Following the 2001 replacement of the FL-series Business Class with the Business Class M2, development was underway on a new-generation Thomas Saf-T-Liner conventional school bus. In 2004, the Thomas Saf-T-Liner C2 made its debut, marking the first completely new bus body from Thomas since 1972. In a shift from industry precedent, both the Thomas body and Freightliner chassis were designed together as a common unit (allowing the use of the dashboard in nearly its entirety); as a drawback, the pairing negated the use of the Freightliner C2 chassis by other body builders. In contrast to the Saf-T-Liner Conventional, the C2 is designed with a larger, sloped windshield, larger windows and exits, and different body construction. For 2009, Thomas launched a second model line of small buses. Named the Thomas MyBus, the model line is geared towards the MFSAB (activity bus) segment. Sharing its internal structure with the Minotour, the non-yellow MyBus is designed for applications without any need for traffic control. 2010s In 2010, John O'Leary was succeeded as company president by Kelley Platt; the first female leader of a major school bus manufacturer, Platt served as manager of treasury services during the Freightliner acquisition of Thomas Built Buses. In 2011, Thomas marked the introduction of the 2012 Saf-T-Liner EFX, its first all-new front-engine bus since 1994. Using similar design features as the Saf-T-Liner HDX (its windshield and upper bodywork), the EFX also utilized a center-mounted Freightliner instrument panel. During the early 2010s, Thomas expanded its environmentally friendly product line. The Saf-T-Liner C2e hybrid diesel-electric school bus (introduced in 2007) met with little success, leading to its withdrawal in 2013; instead, the company invested in its alternative-fuel product lines. Having offered compressed natural gas (CNG) since 1993 in the Saf-T-Liner ER, the Saf-T-Liner C2 gained propane and CNG offerings (in 2014 and 2016, respectively). Alternative fuels became available