This mod permits track to be built upon water.
I'm playing a Ribbon World game, and I was building track along the bottom edge when I by accident built track off the edge of the map. I was curious if I could drive my train there as well. As seen by the picture, both of these were possible.
In a funny moment, (it was a multiplayer stream), I tried to get out of the train to see what would happen. Fortunately, it wouldn't let me. Anyway, here's a screenshot of the moment and I'll link the stream video as well.
![Image](https://forums.factorio.com/images/ext/87d875ff8bbf0b809c5490bd4bf3fd8a.png)
Twitch stream : https://www.twitch.tv/videos/423699461?t=04h57m07s