Directional rails(crafted with copper)

Following the bunch of new copper additions, here is another idea: a directional rail, crafted like powered rails, but with copper blocks replacing gold.

This type of rail would push minecarts only towards one direction when activated. For instance, if a minecart is put on it not being in touch with a block, would still start to move in the direction the rail points.

I think it would be useful in redstone contraptions, not to mention the several uses on regular builds.