Updated December 8, 2015 at 12:30 pm: I checked with the TTC about the termination of both the 509 Harbourfront and 511 Bathurst routes at Fleet Loop rather than simply running one route between Bathurst and Union Stations. Here is the reply from TTC Service Planning:
We considered running a 511 (Bathurst Stn-Union Stn) service but ruled it out for two main reasons. Firstly, stop usage on Fleet west of Bathurst has greatly increased in the last year, and serving these stops only with the shuttle bus would introduce a transfer or longer walk for too many people. Secondly, because of the road configuration and traffic patterns, it is not possible to have a northbound stop for through 511 cars on Bathurst at Lake Shore. The nearest stop would be the existing 509 stop on Bathurst farside of Queens Quay. This adds to the walking distance for customers heading to Fleet Street, and requires customers to cross an inhospitable intersection.
The original article follows below:
The new year brings changes to some routes, mainly on the streetcar system, to deal with the shortage of new Flexitys and a construction project while improving service on 501 Queen, 502 Downtowner and 503 Kingston Road to better reflect actual conditions.