Both the "Due Diligence Report" (2008) and "Updated Due Diligence Report" (2013) state that no existing high-speed system currently meets the proposed operation speed and safety goals. It notes that the highest "cruising" HSR speed in the world on production runs is about in France, and this is significantly less than the "sustained" speed of the CHSRA plan requires. They also note safety concerns in running at top speed through highly populated urban areas such as Fresno. For three years Chinese HSR trains ran at , but the speeds were reduced due to safety concerns and – mostly – costs. In fact a Siemens Velaro trainset without any modifications has posted a speed record well in excess of , though economic considerations keep them limited to in revenue service. The French Alstom TGV Duplex is also able to sustain speeds of 360 km/h, as have shown several days of testing in 2008, not to mention all new TGV speed lines designed for 320 km/h are tested at the speed of 352 km/h (commercial speed + 10%) by TGVs.