I wouldn't count on hearing anything by next week or the week after either.
You might get something back this coming week, but don't be disheartened if you don't hear anything for up to a month.
From what I've heard, there's no set start date for the first group so there doesn't seem to be a rush to get you guys in.
Remember, it's the rail industry, things are done slow, if you get the job, it may take up to 12 months before you get the offer of employment. When things are done fast, it's because they needed it done 2 weeks ago lol. Patience is the key. And good luck!