Premise:
"One of your 'little ideas'?"
Hypothesis: It's another one of his small ideas.

yes

Premise:
"In a region that long ago eschewed train travel, railway romance still permeates Union Station (800 N. Alameda St.)."
Hypothesis: Every day in Union Station you can see couples being reunited.

it is not possible to tell

Premise:
"It may require in-depth data collection dependent on sensitivity to the setting that takes time to acquire and involve extended periods for data analysis, interpretation, and reporting."
Hypothesis: Extended in depth data collection may be required.
yes