Two Rock Island E units survive, E8 No. 652; and E6 No. 630. As part of the Kalamazoo Terminal Route, I set out to do Rock Island E8 No. 652 in the original "Rocket" Scheme, and the more recent "simplified" scheme from Iowa. Both versions are included.
As a mate, 652 regularly ran with Rock Island E6A No. 630. Naturally we have no E6A in Train Sim, but I have done a skin of the E8 as a place-holder E6 No. 630 in both the Rocket Scheme from Kansas in the 2000s; and the simplified scheme from Iowa.
This pack requires the DTG Amtrak E8 Pack; and uses the TruRailSimulation E8 2x-12-567 sounds, which are repacked in the Kalamazoo folder; as well as Mr Nunez's E7 horn sounds; and the TSC Nathan M5 and Wabco E2 sounds; all included here.

To install, run the included .Bat file; or drill down and copy the folders to RailWorks\Assets\DTG\AmtrakE8Pack01\RailVehicles\Diesel\EMD-E8-Amtrak and then copy the .GeoPcDx files from RailWorks\Assets\DTG\AmtrakE8Pack01\RailVehicles\Diesel\EMD-E8-Amtrak\Engine.

To use this locomotive, tick the DTG>AmtrakE8Pack folder in game; as well as the Kalamazoo>EUnitPack01; and Kalamazoo>CoveredWagonPack01 folders.
The light flares are by Martin Ashwill; and the headlight housing child objects are by Kris, here on RWA, as Kris120; and are used with permission.

As ever this reskin pack is installed at your own risk, and is simply intended as a fun freeware item, with limited assistance being provided on the forums. Please check out the other KTR: Kalamazoo Terminal Packs; and the other E unit packs that I have created or modified to represent every surviving E6-7-8-9 as of the start of the Kalamazoo project (sadly a few have since been lost since it began).
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Please let me know if you encounter any issues.

Cheers,

'PullmanCar'
-Jacob