From the time the Rio Grande Zephyr starting running in 1971 when Amtrak formed until 2010, the Zephyr (whether it be the Rio Grande Zephyr or Amtrak's California Zephyr) typically used Track 1 at Union Station. However, with the building of the new commuter rail infrastructure, commuter rails needed Tracks 1-3 (and Tracks 6-8). Consequently, "heavy rail" is restricted to using Tracks 4 and 5. The Zephyr, as seen here, typically uses Track 4. The Winter Park Express (when in season) typically uses Track 5.
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