The conversion work was performed by several different companies, principally the rolling stock refurbishment firm Brodie Engineering and the hydrogen energy specialist Arcola Energy. Particular attention was paid to the unit's weight, necessitating accurate measurements throughout the project, to avoid the additional equipment imposing excessive axle loads and dynamic gauging constraints. New apparatus included Arcola'd A-Drive hydrogen fuel cell powertrain, along with hydrogen tanks and battery modules underneath every coach; the weight gain was partially offset by the removal of old traction equipment, the original DC motors were replaced by modern AC counterparts. Where realistic to do so, issues were normally addressed via mechanical engineering-based solutions rather than via custom software, as this was viewed as a less complicated and more practical due to the unit's bespoke nature. It believed that the modified unit shall satisfy existing main-line certification requirements. The majority of the conversion work was performed following the unit's relocation to the Bo'ness and Kinneil Railway, outside Glasgow, in December 2020.