At the timetable change in December 2022, the "Goldenpass Express" (GPX) started with a first train pair on the Interlaken East-Montreux line, a joint product of MOB and BLS with a direct train that can be re-gauged. From Interlaken Ost via Spiez to Zweisimmen, the train runs on standard gauge (1435 mm), continuing on meter gauge via Gstaad to Montreux. But at the end of February 2023, BLS prohibited further operation on the standard gauge section, as unacceptable wear was found on various switch frogs, which could be traced back to the new vehicles. After extensive test runs and a correction of the wheel spacing (the bogies do not have continuous axles but single wheels), service could be resumed on June 11, initially with a daily train pair starting at Montreux in the morning. Re 465 # 002 of the BLS pull the GOLDENPASS EXPRESS PE 4075 from Interlaken Ost via Spiez to Zweisimmen (further to Montreux with a locomotive of the MOB) over the Bunschenbach viaduct between Weissenburg and Oberwil im Simmental. Behind the locomotive is the interface car Bsi # 291, followed by cab car Ast # 184 with Prestige class, first class car As # 194, second class car Bs # 284 and cab car ABst with second and Prestige class # 384. The cars were designed by Pininfarina, built by StadlerRail, the gauge changeable bogies by Alstom.
