several changes to the design were announced in december 2014. the major changes involve revising platform lengths at all stops to support an increase in the length of the trams from 45 metres to 67 metres, redesigning several stops, switching technologies for the delivery of the wire-free section and the removal of a proposed stop at world square. it was also announced that the projected cost had increased from $1.6 billion to $2.2 billion. the government claimed the increase was due to the design modifications, but a 2016 report produced by the audit office of new south wales found that the increase was largely due to tfnsw underestimating the cost of the project.