Ah, I overlooked the 'railway=site' tag, and it better fits the situation. I'll start updating the tags.

This information can be found in the Canadian Trackside Guide, which is available for purchase publicly. The exact locations I know mostly through personal experience.

I had a look at Lorette in the Banque de noms de lieux, and though the node in OSM matches what's there, I've been to the site can confirm that the station name sign is in the location where I dropped a new node about 150' east of the crossing, likely where the old station once stood. You can see it, and the 'begin/end main track' signs associated with it, quite clearly in Street View from Route de l'Aéroport, behind Hotel Must.