The three Hornby Thomas locos we have all seem to rocket around the track at the maximum throttle speed, while my children consider the Bachmann class 24 diesel to be rather slow. So I have estimated the scale speeds being achieved:
Gordon 270km/h Percy 250km/h Thomas 190km/h
Bachmann class 24: 115 km/h
Do proper (faceless!) steam engines from Hornby or Bachmann also have such silly top speeds? What would have been realistic values for the prototypes of these engines?