I've been reading and I from what I see the answer is no, but asking for clarification.

Can Service A (in project A) talk to Service B (in project B) via Railway's private networking?

My use case is the following:
I want to have an observability project (opentelemetry stack) which I wish to re-use across my different apps.

In the past, I had this otel collector scrape different service via a private network. Can I do that with Railway?

Or will I need to have a collector per project?