sentences:  The first units （CRH1-001A） were delivered on August 30, 2006, the CRH1A sets started service from February 1, 2007 at the Guangzhou -Shenzhen Railway.In July 2010, the Chinese MOR ordered additional 40 sets of CRH1A, The designed top operating speed increased to 250 km/h, In September 2010, during test run at Qinshen PDL, top speed of CRH1-081A reach .In September 2012, The MOR issued a revision in the Zefiro contract, which calls for the order of an additional 106 eight car Zefiro 250 (46 sets) and Zefiro 250NG (60 sets) train sets in lieu of the cancellation of the 16 car Zefiro 380 sets.