The Copper Rail

It does not need a block nearby to start pushing, like vanilla powered rails.
Copper rails have to be powered to work. They would act as unpowered golden rails otherwise.
Just like activator rails don't power golden rails, copper rails also don't share redstone power with other rail types.
Pushing direction is determined by position of the player who placed the rail.
Two of them can redirect a minecart that is running on full speed!
As a bonus, these rails also generate in mineshaft loot chests, just like all vanilla rails.

Example use of copper rails to redirect a minecart

This mod has been inspired by u/schevve_.

External resources