§ 43. Persons with whom contracts may be made. Nothing contained in
this chapter shall be deemed, or be construed as intending to limit, or
as limiting, in any manner, the discretion of the board of
transportation, provided in the opinion of the board of estimate and the
mayor, it is expedient, practicable and in the public interest to do so,
to enter into contracts for construction, equipment, maintenance and
operation with the same person, or for any one or more of such purposes
with the same person or with different persons either in one contract or
in separate contracts, and at any time or times.