mr_dave1947 Can someone bring me up to speed on what you mean by 'Tier 3 and Tier 4'? I'm just getting into train watching after a long time away. Also, are these 'Tags' identifiers as to your favorite RR or field of interest? Thanks. Mr_Dave
Can someone bring me up to speed on what you mean by 'Tier 3 and Tier 4'? I'm just getting into train watching after a long time away. Also, are these 'Tags' identifiers as to your favorite RR or field of interest? Thanks.
Mr_Dave
What the "Tier" designations refer to are the current and soon to be implemented emissions (pollution) standards for large diesel engines, specifically as they are applied to locomotives.
Tier 3 is in place right now and Tier 4 (a much stricter set of regs requiring significant changes to locomotive designs) is coming in 2015.
There have been a number of good discussions on both the "Locomotives" and "General Discussion" forums about the issue which can be found using the site's search function.
"I Often Dream of Trains"-From the Album of the Same Name by Robyn Hitchcock
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