For the standard gauge Spirit of Progress ( SOP ) service, several _BZ_ carriages were transferred from broad gauge in 1961.
The carriages were classed as VFK, numbers 1 to 6.
Cars 1 to 4 were converted in 1961.
Car 5 was built from the car shell of BZ 13. BZ 13 caught fire in the workshops during construction. It was issued to service in 1962.
Car 6 was converted in 1962.
In 1984, the class was renumbered from 1 - 6 to 271 - 276.
By 1991, VFK 1 had been converted to BZS_.
File c484m compiled by Peter J. Vincent, updated 25/11/2007