Quote:
Originally Posted by domusile
What's the tunnel for?
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The tunnel was originally cut in 1931, and allowed the trains from Waterfront Station to be moved to the Drake Street railyards to be cleaned, supplied and made ready for the trip back to the east. Before it was built,
full scale steam trains could block the Downtown streets they crossed for up to 20 minutes. Eventually CP’s use ceased in 1979.
Part of the tunnel was re-purposed by Skytrain when the Expo Line was constructed. The tunnel wasn't wide enough to have two trains side-by side, which is why the tracks are on top of each other in part of the Downtown route of the Expo Line.