Got it figured out.
1)
Copy sd40_2_numbers.dcsv
from: Assets\Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\Black\Engine
to: Assets\Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\CSX\Engine
2)
Modify Assets\Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\CSX\Engine\sd40_2_black.bin
as follows, where items in red indicate add:<NumberingList>
<cCSVContainer>
<CsvFile d:type="cDeltaString">Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\CSX\Engine\sd40_2_
numbers</CsvFile>
</cCSVContainer>
</NumberingList>
<NumberingFormat d:type="cDeltaString"></NumberingFormat>
<Numberings d:type="sUInt32">0</Numberings><FrontCouplingBlueprintID>
.
.
.
.
<BlueprintID d:type="cDeltaString">RailVehicles\Diesel\SD40-2\CSX\CabView\SD40-2 Headout Camera.xml</BlueprintID>
</iBlueprintLibrary-cAbsoluteBlueprintID>
</HeadOutCameraBlueprint>
</cEngineComponentBlueprint>
</RailVehicleComponent>
<RenderComponent>
<cAnimObjectRenderBlueprint>
<PrimaryNamedTextureSet>
<iBlueprintLibrary-cAbsoluteBlueprintID>
<BlueprintSetID>
<iBlueprintLibrary-cBlueprintSetID>
<Provider d:type="cDeltaString">Kuju</Provider>
<Product d:type="cDeltaString">RailSimulatorUS</Product>
</iBlueprintLibrary-cBlueprintSetID>
</BlueprintSetID>
<BlueprintID d:type="cDeltaString">RailVehicles\Diesel\SD40-2\CSX\Engine\Textures\SD40-2_
Digits.xml</BlueprintID>
</iBlueprintLibrary-cAbsoluteBlueprintID>
</PrimaryNamedTextureSet>
<SecondaryNamedTextureSet>
<iBlueprintLibrary-cAbsoluteBlueprintID>
<BlueprintSetID>
<iBlueprintLibrary-cBlueprintSetID>
<Provider d:type="cDeltaString">Kuju</Provider>
<Product d:type="cDeltaString">RailSimulatorUS</Product>
</iBlueprintLibrary-cBlueprintSetID>
</BlueprintSetID>
<BlueprintID d:type="cDeltaString">RailVehicles\Diesel\SD40-2\CSX\Engine\Textures\SD40-2_
Digits.xml</BlueprintID>
</iBlueprintLibrary-cAbsoluteBlueprintID>
</SecondaryNamedTextureSet>
<GeometryID d:type="cDeltaString">Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\CSX\Engine\[00]sd40_2_black</GeometryID>
<CollisionGeometryID d:type="cDeltaString">Kuju\RailSimulatorUS\RailVehicles\Diesel\SD40-2\CSX\Engine\[00]sd40_2_black</CollisionGeometryID>
3) Then in scenario editor, place and double-click the engine. On the right side flyout, renumber the engine to "0" and hit enter.
