Switzerland: Bt (units 31 - 33)

3x Bt control cars were acquired in 1965.

They are registered as units 31 to 33.

Sources: https://en.wikipedia.org/wiki/Martigny–Orsières_Railway

Control car Bt 31 is destroyed during the collision between two ABDe 4/4 railcars (units 6 and 8) at Martigny-Bourg on September 1st, 1984.

Sources: https://en.wikipedia.org/wiki/Martigny–Orsières_Railway

Destroyed control car Bt 31 is replaced by a similar unit acquired from Val-de-Travers Regional Railway Company (RVT) where it was registered as Bt 201.

Sources: https://en.wikipedia.org/wiki/Travers–Buttes_railway, https://en.wikipedia.org/wiki/Martigny–Orsières_Railway