---
kind: "section"
citation: "40 C.F.R. § 1033.655"
title: "40"
number: "1033.655"
heading: "Special provisions for certain Tier 0/Tier 1 locomotives."
url: "https://uscodex.org/cfr/40/1033.655"
---

# §1033.655. Special provisions for certain Tier 0/Tier 1 locomotives.

- (a) The provisions of this section apply only for the following locomotives (and locomotives in the same engine families as these locomotives):
  - (1) Locomotives listed in Table 1 of this section originally manufactured 1986-1994 by General Electric Company that have never been equipped with separate loop aftercooling. The section also applies for the equivalent passenger locomotives.
  - (2) **SD70MAC and SD70IAC locomotives originally manufactured 1996-2000 by EMD.**
- (b) Any certifying remanufacturer may request relief for the locomotives covered by this section.
- (c) You may ask us to allow these locomotives to exceed otherwise applicable line-haul cycle NOX standard for high ambient temperatures and/or altitude because of limitations of the cooling system. However, the NOX emissions may exceed the otherwise applicable standard only to the extent necessary. Relief is limited to the following conditions:
  - (1) For General Electric locomotives, you may ask for relief for ambient temperatures above 23 °C and/or barometric pressure below 97.5 kPa (28.8 in. Hg). NOX emissions may not exceed 9.5 g/bhp-hr over the line-haul cycle for any temperatures up to 105 °F and any altitude up to 7000 feet above sea level.
  - (2) For EMD locomotives, you may ask for relief for ambient temperatures above 30 °C and/or barometric pressure below 97.5 kPa (28.8 in. Hg). NOX emissions may not exceed 8.0 g/bhp-hr over the line-haul cycle for any temperatures up to 105 °F and any altitude up to 7000 feet above sea level.
- (d) **All other standards and requirements in this part apply as specified.**
- (e) To request this relief, submit to the Designated Compliance Officer along with your application for certification an engineering analysis showing how your emission controls operate for the following conditions:
  - (1) **Temperatures 23-40 °C at any altitude up to 7000 feet above sea level.**
  - (2) **Altitudes 1000-7000 feet above sea level for any temperature from 15-40 °C.**

## Notes

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 73 FR 37197, June 30, 2008, unless otherwise noted.