The issue with trains isn't necessarily the trains themselves, but rather the abundance of different third-party radars that turn trains into overwhelming hordes. Over time, trains have become so good at relying upon this information resulting in overcrowded "bullet trains" because there are too many participants to wait. It's so bad that if you die and don't get a res immediately, you will be late to the next mark before it's dead. Hunts were not designed with cross-world/cross-data center travelers trying to weasel their way into every hunt.