On January 17, 2013, Amtrak announced that it has entered a collaboration with the California High-Speed Rail Authority to draft up specifications for the standard high speed train set to be used along the Northeast Corridor and replace the original Acela train sets. The joint order was planned to be for 62 trainsets, with 32 earmarked for the NEC, and having a capacity of 400-600 people. In June 2014, plans for the joint order were abandoned; according to Amtrak, the two companies' requirements were too different to make a joint order economically and operationally feasible. In September 2015, Amtrak selected Alstom as the builder of 28 Acela replacement trainsets and entered into exclusive negotiations with the company, expected to yield a firm contract worth roughly $2.5 billion by the end of the year.