If the electrical system is liquid cooled, it should be possible to pull heat out (must have been done by someone already), my concern is: is there enough?
Relevant part on page 24, copied below for the lazy:
Vehicle Delivery: Due to repeated delays in delivery schedule from BYD and
delays to submission of non-bus deliverables required under contract, on May
3rd, 2019, TTC issued BYD a formal vendor performance review. Subsequent
letters were sent to BYD on May 6th and May 27th advising that TTC would not be
exercising options for additional buses under this contract and requesting follow-
up on the requested action plan to improve performance on the base contract for
10 eBuses. TTC has engaged in discussions with both New Flyer and Proterra
who have confirmed that they would be able to increase their option order by 5
buses each, allowing TTC to fulfill the Board directive to deliver 60 eBuses under
the Public Transit Infrastructure Fund even if the negotiated procurements were
not split equally between vendors.