Here is a thought: not sure what the train was that inspired it, but it’s probably something to do with purpose/meaning, and I was also reading Exodus. Here goes.
Urgency and patience.
That is the difference between how you make choices and how you sit in expectation of results (perhaps from those choices).
Urgency to please God and ‘wait on him’ in obedience.
Patience in waiting for God’s plan to unravel and play out.