Union Station
Work at Union Station has progressed to the point where the existing link between the railway and subway stations is affected by construction.
The westernmost door leading onto the moat outside of the GO Bay Street Concourse from the subway has been closed, and space in the subway west mezzanine formerly occupied by rather tired shops has been walled off. There is a narrow passage from the fare barrier to the westernmost stairway down to the subway platform. (The escalator to the same space was out of service today, March 11, for repairs, but it should be back in operation for Monday, March 12.)
Of the two stairways leading from the south side of Front Street down to the subway, the western one is now closed.
These arrangements will allow for construction of the western part of the new fare control area under Front Street.

The moat looking west. The hot dog vendor is still doing business surrounded by construction, but the westmost exit from the subway mezzanine is fenced off.

The moat looking east.

The excavation directly in front of the main doors of Union Railway Station. The large concrete box on the left side of the photo is the subway station, and the deep trench will be the space for the new northbound-to-Yonge platform.
King Station and Crossover
On the weekend of March 23 to 26 starting at midnight on Friday the TTC will close the Yonge subway between Bloor and Union for the first stage of installation of the new crossover at King Station. Preliminary work is already underway, and there is a slow order through this area. If past experiences at College and St. Clair are any indication, we can expect two more shutdowns in coming months.
Activation of the three new crossovers will not occur until the signal system replacement project finishes in a few years. The original crossovers at these locations were never electrified and there is no provision in the existing signal system to manage them.
Also, the power feeds on either side of the crossovers are not set up to allow isolation of the crossover territory as a terminal. When Bloor crossover was done many years ago, new section gaps were added at the south end of the station and midway north to Rosedale so that power could be maintained on both sides of a crossover even if there were a shutdown further north or south of Bloor. Changes to the power feeds will be done concurrently with the signal work.