Unbudgeted

He said other unbudgeted costs had to be considered, including a projected $150 million for new subway cars needed to run on the extended line. Mr. Sander, who inherited the deal when he took over the authority in January, said he spoke yesterday to Daniel L. Doctoroff, the deputy mayor for economic development, to explain the authority’s position.

Unbudgeted expenditure was but a contributory factor in the initial £2.5bn estimate for the WCML upgrade eventually costing four times as much.