With Factorio 0.16 and artillery it would be nice to get a signal for enemy bases as well.
This would allow to setup a defence outpost and as soon any enemy expands into the range of the radar it would set some signal which then can be used to call the mobile artillery. The artillery would then autofire on all bases in range. Sure a stationary artillery would do the job but not as cool as a automated "Battletrain"
