EPA Tier 4 Requirements Question

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Santa Fe buff

Santa Fe buff

Member
G'day,

I'm confused here. I was under the impression that EPA tier 4 rules were a requirement for all new mainline locomotives, but I noticed Norfolk Southern recently purchased ES44ACs which are historic comparatively and only meet tier 2.

Is this something that's been relaxed recently, or is Norfolk Southern incorrect?

Thank ya!
 
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