(a) Locomotives were originally subject to Tier 0, Tier 1, and Tier 2 emission standards described in paragraph (b) of this appendix as follows:
(1) The Tier 0 and Tier 1 standards in paragraph (b) of this appendix applied instead of the Tier 0 and Tier 1 standards of § 1033.101 for locomotives manufactured and remanufactured before January 1, 2010. For example, a locomotive that was originally manufactured in 2004 and remanufactured on April 10, 2011, was subject to the original Tier 1 standards specified in paragraph (b) of this appendix and became subject to the Tier 1 standards of § 1033.101 when it was remanufactured on April 10, 2011.
(2) The Tier 2 standards in paragraph (b) of this appendix applied instead of the Tier 2 standards of § 1033.101 for locomotives manufactured and remanufactured before January 1, 2013.
(b) The following NOX and PM standards applied before the dates specified in paragraph (a) of this appendix:
Table 1 to Appendix A—Original Locomotive Emission Standards
| Type of standard
| Year of original manufacture
| Tier
| Standards
(g/bhp-hr)
|
|---|
| NOX
| PM-primary
| PM-alternate
a
|
|---|
| Line-haul | 1973-1992 | Tier 0 | 9.5 | 0.60 | 0.30
|
| | 1993-2004 | Tier 1 | 7.4 | 0.45 | 0.22
|
| | 2005-2011 | Tier 2 | 5.5 | 0.20 | 0.10
|
| Switch | 1973-1992 | Tier 0 | 14.0 | 0.72 | 0.36
|
| | 1993-2004 | Tier 1 | 11.0 | 0.54 | 0.27
|
| | 2005-2011 | Tier 2 | 8.1 | 0.24 | 0.12
|
(c) The original Tier 0, Tier 1, and Tier 2 standards for HC and CO emissions and smoke are the same standards identified in § 1033.101.
[88 FR 4486, Jan. 24, 2023]