As a person who is doing North American trains I reckon the SC-44 Siemens Chargers should be added as a loco add on for Surfliner, Miami to West Palm Beach or any other routes that contains Amtrak. These locomotives can also be on commuter trains like MARC or COASTER. Note this is NOT my image.
There have been multiple attempts by third party creators, however nothing has surfaced, especially since there is no good route to use it on yet except maybe pacific surfliner, but that's an old route. The streamlined Brightline version could also exist, but one would have to get Brightline branding.