These feature layers I'm working with were created from a File Geodatabase:
Here's how it looks in the legend:
If I rename a feature layer in the web map it doesn't save. So I save it and create another web map. I use that layers' service URL in my script and the title in the legend still is there twice, as it looks in the image above.
It seems like it should be simple, but how do I change the title to just "Route 66", for example?