This is my solution to an age old artillery train problem: How do you get a single train to regularly patrol all available stations? The answer is using the new wireless signal transfer, which was recently introduced together with train limits, to remotely reset all stations after every roundtrip.
To accomplish this, the artillery loading station has an extra "transmitter" train, which constantly paths to the station right in front of it. When the artillery train enters the loader, the station in front of the transmitter train is disabled and it repaths to any new station on the train network with the same name. Every shooting place conveniently has one of these similary named stations and will register the train pathing to it through the new "Read train count" option on the train station. This will generate a circuit signal, which triggers an R/S latch that deactivates the receiver station and activates the artillery station. Because the receiver station is now disabled, the transmitter train is forced to repath to the next receiver, which will repeat the process until all receivers are disabled and all artillery stations are enabled. Then, after stocking up on fuel and ammunition, the artillery train will drive to each artillery station in turn, resetting their R/S latches and exterminating adjacent biters in process. It will return to the loader station last, even though it's named the same as the shooting stations, because of the huge penalty applied by all the dummy stations in front of it.
