In 1988, when the idea was born to improve restaurant car service by serving regional specialities, the unloved WR 88-33 610 - 616 self-service cars became prime candidates for conversion.

The Swiss Cheese Union was enthusiastic about the new concept as an opportunity to promote their product, and in co-operation with Minibuffet AG, an established refreshment trolley operator, the first Cheese Express car came into service (WR 50 85 88-33 700 converted from WR 50 85 88-33 615-8).

A completely new interior and a modern kitchen are fitted. The tables are all equipped to take heaters for fondue and raclette. For those wishing to enjoy the cheese specialities, there are thirty individual chairs arranged at two- and four-place tables. Electric power supply is provided from the locomotive, or the coach's own pantograph can be raised to provide an independent supply, for example during a locomotive change. In the roof there is a 850 litre water tank, feeding the taps and the washing machine (an ultra-violet steriliser ensures good water quality).

The first route chosen was from Basel and Bern to Canton Valais. Raclette, fondue and white wine were served on board, as well as draught beer with up to twelve customers that can stand at the bar.

The success of the project was shown by the introduction, in 1991, of a second Cheese Express car (WR 50 85 88-33 701 converted from WR 50 85 88-33 616-6), followed by a third car (WR 50 85 88-33 702 converted from WR 50 85 88-33 614-1) later on.

The Cheese Express colour scheme is designed by Sonja Bigler of the Bern Art School and her teacher Claude Kuhn. The cars have the inscription "Chäs-Express RESTAURANT Fromage-Express" until the autumn of 1992 when the word "RESTAURANT" is replaced by the logo "Le Buffet Suisse".  

Units 88-33 701 & 702 are acquired by SBB Historic in 2003 and repainted in dark red.  

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