 By 1943, Midland Electric were producing five models, which could be fitted with various types of bodywork, including a flat-bed truck for coal deliveries.The B12 catered for a payload of 10–12 cwt, the BA12 for 12–15 cwt, the B20 for 18–22 cwt, the B25 for 25–28 cwt, with the largest model, the B30, suitable for 30–35 cwt.The controller was operated by a foot pedal, and transition between stages was regulated by an air delay mechanism.