Why not run for the train? Because another train will be along shortly. Such is the nature of trains. Running will cause you to miss everything between you and your object, and more often than not leave you disappointed and out of breath.
From the Dorian Taylor post La Forme de flaner about trusting in serendipity and investing in a schedule.
Image source: www.flickr.com/photos/aftab/3407679291/in/photostream
