After the nationalization of the private railways had the SBB in their fleet a wide variety of car types, which were not up to the new requirements. Based on positive experiences with wagons with axles of 9.00 m, standards were set for the new types to be procured. For Nebenstrecken the biaxial second class carriages were included in the program.

The cars were built as transit cars, had wooden benches and each offered 30 seats for smokers and nonsmokers. In Wagenmitte there was an abortion. Leaf springs of 1.80 m length were sufficient for the set in this simple vehicle claims.

Registration numbers: C3 6921 - 7290
8118 - 8220

1932: 20 cars to C3 Nos. 85 ....
From 1947 9071-90. 1960 still 13 cars in operation.
1941: 1 car to C3 No. 7371 surround. From 1947 Nrt. 9105th
1925: 1 car to X3. (Company cars)