| Number | Model | Qty | Notes |
|---|---|---|---|
| PB1 - PB3 | Slug | 3 | "Powered Boosters," PB3 stored, out of service |
| 1500-1503, 1505, 1507, 1509-1512, 1515-1516, 1520-1524 | SW1500 | 17 | Remanufactured, renumbered from 9200 class |
| 1504, 1506, 1508, 1514 | RP15BDF | 4 | Dual Fuel CNG units, ex-SW1500. 1504 and 1514 paired, |
| 2020-2022 | Slug | 3 | Converted from 3GS21B four axle gensets. |
| 3800, 3801, 3802, 5627, 5629 | GP38-2 | 5 | 3800 upgraded to dash-3 status; wears "Salute Our Troops" livery |
| 3861 | SD38-2 | 1 | Rebuilt, de-turboed SD40 |
| 4010 | GP40P-2 | 1 | Remanufactured ex-SP unit |
| 4011-4014, 4016-4019 | GP40-2 | 8 | Remanufactured ex-SP units, 4015 traded in |
| 4020-4022 | GP40-2LW | 3 | Rebuilt wide cab units, ex-CN. Paired with converted gensets. |
The six-axle gemsets, 2160-63, were retired in January, 2022, and scrapped in 2023.
Slugs 477, 478, 479 were scrapped in 2021.
Slugs 2020, 2021 and 2022 were converted from gensets 2140, 2143 and 2141 respectively. 2142 was scrapped.
Geeps 4020-22 arrived in September, 2020. They replaced three SD20s that were trade-ins. They have been paired with the three converted gensets: 4020 with 2020, 4021 with 2021 and 4022 with 2022.
Slugs PB1 and PB2 are paired with SW1500s: PB1 with 1520, PB2 with 1500.
In 2019, IHB began repainting their lodomotive fleet in an orange-black livery resembling the very first paint scheme from the late 1940s.
GP40P-2 4010 was a Southern Pacific bicentennial unit.
At one time or another, nearly eighty NW2s wore IHB paint. The last two remaining units, 8811 and 8814, were retired during the summer of 2011 after 61 years of continuous service. SW1200s 2256 and 2272 were also retired during this period. All four were trade-ins for gensets 2140-43 and will have their engines scrapped in accordance with a federal/state program that provided financial assistance for purchasing the gensets. A similar fate befell the trade-ins for the six axle gensets: SD20s 2921-22 and 2925, as well as SD38-2 3862.
Thirty-eight SW7 and all SW9 units were sold or retired by 2004. A few of the NW2s and SW7s were converted to slugs.
For more information, go to the IHB Archive All-time Roster page.