See SPIGOT-7375
See MC-260445. Feature requests/suggestions belong to feedback.minecraft.net, not here.
You're using the wrong rail type; what you're describing isn't a powered rail, but an activator rail.
Duplicate of MC-79835, resolved as "Invalid".
Duplicate of MC-227881. Known problem with your graphics driver; please read the notice provided by the moderation team. (Click on the highlighted, striked-out link on the left.)
Duplicate of REALMS-10537
I was running optifine
Correct, @unknown. OptiFine is a mod, and issues caused by mods aren't supported here in this bug tracker.
Besides that, see also MC-10755; issues caused by amplified effects with a level exceeding than what's possible in survival won't be fixed.
Added another crash report as the first one has stack traces mentioning PrismLauncher, a third-party software not supported by Mojang Studios.
[media][media]