I'm only aware of one single movement of a 1500m test train, consisting of 76 container wagons and three SBB Re 620 locomotives, which would make 322 axles if I

I'm only aware of one single movement of a 1500m test train, consisting of 76 container wagons and three SBB Re 620 locomotives, which would make 322 axles if I'm not mistaken, for the curious. At the same time, that was a run through the Gotthard Base Tunnel, and running onto similarly modernised infrastructure, and hence less likely to have 40 year old axle counters in use.