Which is a lot less than the fastest car (763mph).
But a lot more than the fastest production car (253mph).
Which in turn much faster than the fastest production train (186mph).
But is almost the same speed as the fastest Maglev (360mph). Whoops.
And, in the final analysis, doesn’t really amount to a row of beans. To have trains running at that sort of speed in service would almost certainly require a lot of new track, although given that TGV’s already have in-cab signalling, they might be OK in that department.
And I haven’t even mentioned the cost. High-speed rail schemes are without exception a financial disaster.