Rail
minecraft:railRail is a track block used to guide minecarts across the world. It is crafted from iron ingots and a stick, and automatically orients itself into straight or curved sections depending on the surrounding rails and terrain.
FAQ
How do I craft Rail?
Combine 6 iron ingots and 1 stick in a crafting grid to produce 16 rails.
Where can Rail be placed?
Rails can be placed on full blocks, hoppers, top slabs, upside-down stairs, and top trapdoors, automatically connecting to adjacent rails.
How many powered rails do I need for a minecart line?
An empty minecart needs about 7 powered rails to reach full speed from a stop, then 1 powered rail after every 3 regular rails to maintain it.
Can mobs walk onto rails?
In Java Edition, spiders, cave spiders, and wardens are the only mobs that freely walk onto rails; most others avoid them.