What train are you riding? Most trains depart from the south side. Only the Empire Builder and the trains to Milwaukee leave from the north side. Around 30 minutes the track numbers are announced and posted on big signs near the entrance to the platform.
Stayed there a few times. Great place that had a big room for bag storage with attendants to leave your bags with them. The only bad part was there were only two outlets to charge devises.
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Business class riders must pay for diner meals. Breakfast and lunch is 35. Dinner is 45.