§ 1033.740 Credit restrictions.
Use of emission credits generated under this part is restricted depending on the standards against which they were generated.
(a) Pre-2008 credits. NOX and PM credits generated before model year 2008 may be used under this part in the same manner as NOX and PM credits generated under this part.
(b) General cycle restriction. Locomotives subject to both switch cycle standards and line-haul cycle standards (such as Tier 2 locomotives) may generate both switch and line-haul credits. Except as specified in paragraph (c) of this section, such credits may only be used to show compliance with standards for the same cycle for which they were generated. For example, a Tier 2 locomotive that is certified to a switch cycle NOX FEL below the applicable switch cycle standard and a line-haul cycle NOX FEL below the applicable line-haul cycle standard may generate switch cycle NOX credits for use in complying with switch cycle NOX standards and a line-haul cycle NOX credits for use in complying with line-haul cycle NOX standards.