Due to their country of origin, MBxd2 railcars (as well as their trailer cars – the Bxhpi series) are often referred to as "Rumuni" (Romanians).

[1] Another contributing factor to the decline and restrictions on narrow-gauge railway operations was the poor condition of infrastructure and rolling stock, much of which was outdated, with some dating back to before World War II.

[2] The trailer cars were specifically designed to pair with the railcars, forming the A20D-P diesel multiple unit.

These prototypes differed slightly in appearance from later units, notably lacking the corrugated stiffening ribs on the sidewalls.

The railcars designed for different track gauges varied not only in the width of their bogies but also in the gear ratio used in the reduction gearbox.

Additionally, the interior was equipped with luggage racks, waste bins, and handles for standing passengers.

The rolling chassis housed 12ES180 type rechargeable batteries with a capacity of 180 A and 24 V voltage, fuel and air tanks for compressors, and heat exchangers.

In addition, the control panel featured a reverser for changing the direction of travel and a gear shift lever.