Highway 7 - Kitchener to Guelph

[KevinT]

So apologies if this has been asked/explained elsewhere... but everytime I drive by this area I have the same question.

How do we build the two Wellington/Shirley connector roads under the railway without disrupting our (hopefully increased) service?  Every other overpasses I have witnessed being constructed, the railway snakes around until the underpass is built then rail lines straightened out.  With this one, there is a highway bridge that prevents just moving the line off to the side.

I assume they may just close one of the two doubled lines at a time, but having excavation work that close to the second line I would of assumed as being risky.

Any experts?

Coke

I suspect they'll do it the way the West Toronto Diamond (aka The Junction) was done, pre-building tunnel sections and then ramming them under the tracks in a 24 hour period.  This article summarize that project and gives an aerial view:

http://dailycommercialnews.com/en-US/Inf...-1001713W/