If you mean a steam locomotive a British Mallard ( do not confuse with Mallet) was once clocked at l27MPH in a special downhill speed trial. the engine suffered severe damage to the drive wheels ( did not cause an accident but had internal shakes and cracks) and the experiment was never repeated a man named Duddington was the Engineer with Fireman T.,Bray. (the British preferred the tem engine driver, which we do not use). source, Railroad section of the Guiness Book of World Records. still a record for a steam locomotive I believe she was a 4-6-2 (Pacific) type similar to out Blue Comet in wheel arrangement only.
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the buggati is the fastest production car means it is being produced on a large scale in a factory but the ssc aero is faster than buggati but it is not a production car another car named s barabus tkr by some is considered the fastest car but there is not much information available about it buggati 408.5km\hr ssc aero 256km\hr barabus tkr about 270m\hr
the fastest is the sphinx moth.
the fastest car in the world a v8 Holden
Most of the Hand Bones can heal the fastest.
usain bolt is the fastest runner in the world