1 to 4 (or Baden C) were six-wheeled, narrow gauge, tank locomotives designed for the metre gauge line from Mosbach to Mudau.

The connecting rods drove the third coupled wheels.

This was probably replaced in 1926 by a Westinghouse compressed-air brake.

When the Deutsche Reichsbahn took over the operational running of the state-owned by privately operated line from the Deutsche Eisenbahn-Betriebsgesellschaft, a subsidiary of the firm of Vering & Waechter who had built the line, these engines were incorporated into their fleet as numbers 99 7201 to 99 7204.

Until then they had managed all the traffic, no other locomotives were even employed in a temporary role.