[t0mas88]

That's a special one-off kind of thing.

But the railway museum runs a historic train hourly from Utrecht Centraal (I think the largest station in the country) to their museum. That's also a strange sight to see passing by at crossings.

[Doxin]

While it isn't ordinary operating procedure, it's not exactly one-off either. It has happened a couple times already. At least once in combination with a historic diesel train as well.

[mcv]

I've been to the railway museum a lot (my son is a train nut), and in my experience it's just a regular train, not a historic one.