Hi!
For base game (not SA) and with default enemies - the Railgun Artillery (RA) is more alternative skin with high shooting speed.
For Space Age game - using of RA is a logical part of the railgun turret technology, which already been introduced by the developers.
With any custom enemies - for example, rampant's mod ... the RA is an effective way to stop the spread of enemy colonization and reducing the number of biter's nests )
For the late game, it also encourages you to use more electricity.