Run 520 -- Purple Line
========================================

line:        Purple (#522398)
status:      approaching Merchandise Mart
destination: Loop
position:    41.89030, -87.63548   heading 167 (S)
next stop:   Merchandise Mart  (predicted 2026-08-06T15:14:38)

The CTA positions feed reports only the next stop, so the full
upcoming-stop sequence isn't available here without a separate
per-station query.