Maximum speed records
A one time specially modified system and trainset record was set by the manned TGV's 574.8 km/h run, however it is far from a typical situation. The sheer amount of smoke emitted from the train is evidence that it was meant for proof of concept and not for passenger runs. Safety, cost, reliability, mass production are major concerns for high speed rail engineers and designers, which would not allow such conditions in a scheduled passenger run. 
The record for railed vehicles however is 10,325 km/h (6,416 mph) by an unmanned rocket sled by the United States Air Force.
The fastest maximum operating speed (MOR) of ANY segment of any high speed rail line, currently 350 km/h (217 mph), a record held by China.
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