Nick,
I don't know if anyone created one of these, but I know there are a lot of SWs up there on the DLS.
If you want the RS, you need to create the model from scratch because the actual model is made from a 3d mesh. You could replace the standard trucks with Flexicoil B-B trucks if there are any on the DLS. This is a matter of downloading the bogies (trucks), then changing the config.txt file of the locomotive to reflect the changes in the bogies.
John