In 1932 Kruckenberg began a new project with the rail car involving significant modifications. It was cut just behind the forward wheels and received a complete new front end with a two-axle bogie, resembling the later 137 155 railcar. The rear single axle remained as it was. The modifications were completed by November 1932. The aircraft engine was still used; however, the power transmission was hydraulic through two Föttinger fluid drives for both directions of travel, fitted on the forward bogie. A pointed fairing was installed in place of the propeller. The resulting vehicle was a B-1 with a powered front bogie. This version of the vehicle reached at the beginning of 1933.