This section describes how to test locomotives at each notch setting so that emissions can be weighted according to either the line-haul duty cycle or the switch duty cycle. The locomotive test cycle consists of a warm-up followed by a sequence of nominally steady-state discrete test modes, as described in Table 1 to this section. The test modes are steady-state with respect to operator demand, which is the notch setting for the locomotive. Engine speeds and loads are not necessarily steady-state.
Table 1 to § 1033.515 -Locomotive Test Cycle
Test mode | Notch setting | Time in mode (minutes)1 | Sample averaging period for emissions1 |
Pre-test idle | Lowest idle setting | 10 to 153 | Not applicable |
A | Low idle2 | 5 to 10 | 300 ±5 seconds |
B | Normal idle | 5 to 10 | 300 ±5 seconds |
C | Dynamic brake2 | 5 to 10 | 300 ±5 seconds |
1 | Notch 1 | 5 to 10 | 300 ±5 seconds |
2 | Notch 2 | 5 to 10 | 300 ±5 seconds |
3 | Notch 3 | 5 to 10 | 300 ±5 seconds |
4 | Notch 4 | 5 to 10 | 300 ±5 seconds |
5 | Notch 5 | 5 to 10 | 300 ±5 seconds |
6 | Notch 6 | 5 to 10 | 300 ±5 seconds |
7 | Notch 7 | 5 to 10 | 300 ±5 seconds |
8 | Notch 8 | 10 to 15 | 600 ±5 seconds |
1 The time in each notch and sample averaging period may be extended as needed to allow for collection of a sufficiently large PM sample.
2 Omit if not so equipped.
3 See paragraph (b) of this section for alternate pre-test provisions.
40 C.F.R. §1033.515