A recent trip to Quebec City brought some questions to mind? The Quebec City stop for the Ocean (14/15) is Sainte-Foy. But Sainte-Foy is on the north side of the St. Lawrence. So, the train has to cross the "Bridge at Quebec" (to use the title of Middleton's book) to access the station. How does it then get turned to get back across the river? Why not stop at Charny on the south bank instead? Although that would require a short backup move, at least you wouldn't have to cross the bridge. And if you're going to cross the river, why not go on to Gare du Palais? Given the total journey time for the Ocean, the extra 25-30 minutes in each direction wouldn't see to be that important.
The Ocean did use Charny until 2014 when the station there closed then was rerouted across the bridge to Ste Foy. Here's a post with some details: Note the westbound Ocean arriving from Halifax now runs forward on the wye track from Joffre Yard, through Charny and onto the Bridge to Ste Foy. .......then backs up through the Why into Joffre Yard before continuing west.
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Really no need to go into Gare du Palais as Ste Foy is a convenient suburban station. It would add an additional 25 min each way plus station dwell time and It would also have to be wyed there. Gare du Palais has enclosed high level platforms with insufficient length to handle a train as long as the Ocean.