Show just one trip on the map when selected
Completed
Closure reason
I have good news : All of what you suggest is already possible :D
To show (and share) one or several trips on the map, navigate to your trip list, select one or more trips by clicking on the row. The row will become blue and a blue "create link" button will appear at the bottom. If you click on it you'll see the selected trip.
Regarding the 2nd part of your request, there's the tag function : Click on "Tools" -> "New Tag", and create a new tag with a name and a colour. Once this is done, go back to the trip list, select several trips, click on the up arrow that appears at the bottom, and press "Manage tags", then start typing the name of your tag, and select it when it appears. (it needs to be better integrated in the UI, we're working on it).
If you have further questions, you're very welcome to join the Trainlog Discord, you'll find the invite in the about page :)
Description
It would be nice if you could select a trip and have only that one trip show up on the map. If you could also bundle trips together and name them yourself (e.g. Holiday - New York, Work - Amsterdam) and add trips to that bundle and then have only the bundled trips show up up on the map. This would be good as you would then be able to see where you went and what transport you used on specific trips out over multiple days.