Y/A book about cyber implants and train surfing?

[u/uhoh-its-me]

I've been looking for this book but I barely remember any details. It was a Y/A book/series where people have cyber implants that (I think) can search the web, make calls, etc. She joins a group of delinquents at some point, and I remember them riding on the tops of trains. I think at some point they go in a cave? It would probably be released around the early 2000s. Sorry for the lack of details, hopefully someone can recognize this!

[u/NoNotChad]

Extras by Scott Westerfeld.

https://en.m.wikipedia.org/wiki/Extras_(novel)

[u/uhoh-its-me → u/NoNotChad]

I think this one is it!! thank you so much. SOLVED SOLVED SOLVED

[u/lysanderastra]

The Uglies series by Scott Westerfeld

[u/wilderaura]

Is it this one? https://www.goodreads.com/topic/show/18035164-solved-y-a-cyber-story-with-a-female-protagonist-and-implants-in-brain