(i) To replace, or inspect and qualify, each and every power assembly of a locomotive or locomotive engine, whether during a single maintenance event or cumulatively within a five year period; or
(ii) To upgrade a locomotive or locomotive engine; or
(iii) To convert a locomotive or locomotive engine to enable it to operate using a fuel other than it was originally manufactured to use; or
(iv) To install a remanufactured engine or a freshly manufactured engine into a previously used locomotive.
(2) Remanufacture also means the act of remanufacturing.
40 CFR § 92.2
The definitions of this section apply to this subpart. They also apply to all subparts of this part, except where noted otherwise.