Kitchener double track update, 5 April 2024:
The first phase of the Breslau double track segment is physically complete:
The switch configuration is bizarre. The switch at the west end has the north track as the through route while the switch at the east end has the south track as the through route. So trains always need to slow from 70 mph (112 km/h) to 45 mph (72 km/h) to switch tracks even if they're not meeting any train in the opposite direction.
The platform at Breslau station will be on the north side, so the west switch should have been installed the other way around to allow the train bypassing the station to pass through at full speed. The stopping train needs to slow regardless of the switches.
The Kitchener line website says that there's an upcoming contract to extend the second track further east but that would replace the eastern switch, not the western one.
Although the Guelph second platform is nearly complete and the switch at the east end of the second track is in service, there has been little to no work on the west end of the second track.