Three Swiss metre-gauge operators build common rolling stock platform

Switzerland's three principal metre-gauge operators — Matterhorn Gotthard Bahn (MGB), Rhaetian Railway (RhB) and Zentralbahn — are preparing a joint business case for rolling stock procurement, eighteen months after signing a memorandum of understanding in September 2025.

The cooperation targets a shared technical platform for future vehicle orders across networks that share a track gauge of 1000 mm (metre gauge) but little else in technical terms. A common platform, the operators argue, would cut purchasing costs, simplify maintenance and improve spare parts availability — three outcomes that matter for fleets currently specified separately.

Since the memorandum was signed, the companies have drawn up common technical requirements for future vehicles. The business case now in preparation is the next step toward an actual joint order. No fleet size, budget or delivery date has been published.

What has actually been tested?

The most concrete development so far involves hardware, not paperwork. Zentralbahn has taken delivery of new-generation Stadler FINK multiple units (self-propelled trainsets that can operate as fixed formations), and one of them has now run on a neighbouring network.

At the end of October 2026, one FINK unit was transferred to Visp for trials on the MGB network. The purpose is narrow and specific: the tests are intended to support approval of the trains for operation under MGB's 11 kV AC electrification system.

The voltage difference is the central technical obstacle. Zentralbahn electrified at 15 kV AC, while MGB and RhB use 11 kV AC. All three systems run at 16.7 Hz, the frequency standard used across Switzerland's railway networks. The FINK units have been designed to operate under both voltages, which gives the three operators, for the first time, a credible technical basis for running compatible rolling stock across their networks.

The unit undergoing trials has since acquired a name. It was christened Saltina at a ceremony in Brig on 9 November 2026, attended by representatives of all three operators — a small but deliberate signal that the project is shared rather than bilateral.

Where does the FINK actually fit?

A reader's practical question here is: what does dual-voltage capability actually change for MGB and RhB? The honest answer is that it changes less than the voltage compatibility suggests.

MGB's network includes substantial rack railway sections (segments where trains climb steep gradients using a cog wheel meshing with a toothed rail between the running rails). The FINK units are not equipped for the rack systems MGB uses, and those differences — not just the voltage — restrict where the trains could run on MGB's mountain routes. On MGB's conventional adhesion sections, where trains climb by wheel-on-rail grip alone, operation of the FINK is technically possible.

In other words, the October trials at Visp demonstrate electrical compatibility, not operational interchangeability. The FINK cannot simply be redeployed onto the Matterhorn route's gradients.

Claims against fleet plans

The operators' framing — reduced purchasing costs, simpler maintenance, better parts availability — is a projection, and should be read as one. No joint order has been placed, no supplier has been selected beyond Zentralbahn's existing FINK contract with Stadler, and the business case remains under preparation.

What the trials do establish is that a dual-voltage vehicle built to a current production standard can move between a 15 kV and an 11 kV network at 16.7 Hz and pursue approval there. That is the mechanism the common platform idea rests on: if future vehicles for all three operators share one electrical and systems architecture, procurement can be bundled even where route-level equipment differs.

The next milestones to watch are the completion of the business case, the outcome of the 11 kV approval process for the Saltina unit, and any decision by RhB — which has not yet run the FINK on its own network — to join the testing programme.