Great mod for those of us that like having difficult enemies, so really missed this right when 2.0 dropped.
Wondering if you could you add the rail ramp and rail support/foundation to the invulnerables ? Possibly also signals and normal elevated rails if they are different entities than the on-ground ones :)

They should already be in the list of invulnerables unless I did something wrong?

["rail-ramp"] = true, --Elevated Rails
["elevated-straight-rail"] = true, --Elevated Rails
["elevated-half-diagonal-rail"] = true, --Elevated Rails
["elevated-curved-rail-a"] = true, --Elevated Rails
["elevated-curved-rail-b"] = true, --Elevated Rails
["rail-support"] = true, --Elevated Rails

Hmm, it could be that they are not targeted instead of immune ?
looks like they take splash damage at least, or may be attacked because they're "in the way" like rocks ?

https://paste.pics/040ce5f48402c22eb946b91e992cb4e6

I did lose some elevated rails earlier on so i didn't chance it, so now I'm suddenly unsure how they got destroyed given you've got them in already.

Yeah no, they are just like, actively killing my rails so, something isnt quite working.

https://paste.pics/c07b20d718a04c6b29b658f314672d44
https://paste.pics/6b326f2db3decc14da23996c68823187
https://paste.pics/52ab87431458a6b95aed1ea36c55ec5f

Thanks, fixed. I've split invulnerable rails and bots into two separate mods so you'll need this version instead.

https://mods.factorio.com/mod/Invulnerable_Rails
https://mods.factorio.com/mod/Invulnerable_Bots