Looks like the Intercity 827 Brig - Romanshorn (or some other train along its way) didn't cope well with the weather, so it was replaced in Zurich by this 1960s spare train, which you can see here... (more)
A Madrid - Barcelona AVE service passes us at about 300 km/h, while a freight train goes the other way on the old line down in the valley. No digital cheating involved!