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German DR 18 201 is probably worlds fastest operational steam locomotive. Recorded top speed is 200.4 km/h (124.5 mph) but this was about 80 years ago when it was brand new and had a full streamline cover. During the return run from a 190 km/h test Berlin-Hamburg it did the ~113 kilometres (70 miles) from Wittenberge to a signal stop before Berlin-Spandau in 48 min 32 s, meaning 139.4 km/h (86.6 mph) average between start and stop.
The longest journey this locomotive did in recent history was in June 2011 where it went from Leipzig to Darmstadt and back again. This is about 900 km.