Filtered Train Group Naming

[theclayj2u]

I would find it convenient if train group naming while in the train locomotive menu could be filtered to the individual surface. Similar to how train overview is filtered to surface. I think this would help with focus as the type of trains I use on one surface versus another can be different. Still having access to other groups on surfaces would be nice as well. Sorry if this is already suggested this is my first post here. :p