I just spent 2 hours on peninsula corridor, with nearly 28,000 action points built up, and just before South San Francisco two AI trains are bottlenecked and I can't move. This isn't the only unplayable service I've encountered. Come on guys... Don't you run these services before you release them?
This happened to me on SEHS once. Approaching St Pancras I actually ran into the back of another train. I tried it again and managed to stop before another collision. The station was rammed with trains with no way out for any of them. This hasn’t happened since.
Even if they run each service, everyone will finish them at different times. Sometimes taking too long can cause issues like another train getting in front or even entering your block (CEMOF with the MP15DC).