AMTK 7 and AMTK 23 lead the westbound Zephyr, running right on time as it heads west on the main at Tabernash. The Zephyr still runs exclusively with P42DCs. The new ALC Chargers require a fuel additive called DEF (Diesel Exhaust Fluid) as they are Tier-4 compliant. Rumor has it that Amtrak has been unable to find a DEF provider for Denver. Denver is the refuel spot for the Zephyr between Chicago and Emeryville.
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