RailOptimization

Evidence

Ran on Kiln's test stand (2026-11-04): RailOptimizationFabric did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/event/lifecycle/v1/ServerLifecycleEvents.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.core.SectionPos
• net.minecraft.server.MinecraftServer
• net.minecraft.server.level.FullChunkStatus
• net.minecraft.server.permissions.PermissionSet
• net.minecraft.server.permissions.Permissions
• net.minecraft.world.flag.FeatureFlagSet
• net.minecraft.world.flag.FeatureFlags
• net.minecraft.world.level.block.PoweredRailBlock
• net.minecraft.world.level.block.SupportType
• net.minecraft.world.level.block.state.properties.RailShape
• net.minecraft.world.level.chunk.LevelChunk
• net.minecraft.world.level.chunk.LevelChunkSection
• net.minecraft.world.level.redstone.CollectingNeighborUpdater
• net.minecraft.world.level.redstone.CollectingNeighborUpdater.NeighborUpdates
• net.minecraft.world.level.redstone.ExperimentalRedstoneUtils
• net.minecraft.world.level.redstone.NeighborUpdater
• BlockPos.asLong()
• BlockPos.asLong()
• BlockPos.getX()
• BlockPos.getY()
• BlockPos.getZ()
• BlockPos.of()
• Level.enabledFeatures()
• Level.getChunk()
• Level.getMaxY()
• Level.getMinY()
• Level.hasNeighborSignal()
• Level.isDebug()
• Level.isInValidBounds()
• Level.neighborChanged()
• Level.neighborUpdater
• Level.sendBlockUpdated()
• Level.updateNeighborsAt()
• and 14 more

On the roadmap: Code next to data (0.3), Mixin (0.5)

In the author's words

A simple mod that makes powered/activator rails turn on/off up to 20x faster.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file railoptimization-2.5-snapshot.1+mc26.1.2-fabric.jar. The scan reads the mod's classes; it does not run them.