This mod is a copy of the mod Beautiful Bridge Railway by author kapaer. The only difference is that here curved rails can't be placed on water so that only building straight bridges is possible. Also there is a length limit for bridges. But it is configurable, so you could set it to 999 for unlimited bridge lengths. By default it is set to 20 tiles (10 track pieces).
For original mod please check out https://mods.factorio.com/mods/kapaer/beautiful_bridge_railway
Links
Part of https://mods.factorio.com/mod/schmitts-modpack
Discuss
Here or on discord https://discord.gg/jqq98wws