On the south edge of Big Ten Curve, the Zephyr is making its way west. The Zephyr has not seen many ALC-42 Chargers, the power set to (largely) replace the P42DCs. The Chargers are Tier-4 compliant, and they require special additives mixed in with their fuel. the infrastructure currently does not exist in Denver to include the additives, so the Chargers have not been running on the Zephyr. Rumors are that the infrastructure will be added soon, and Chargers are likely to start showing up in 2025. That means this classic consist may be short-lived.
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