Rails Going In Any Direction

I would love to see rails that go it the direction that they are placed in.

For example, if you placed a rail on the bottom-side of a block, they would literally be upside down. This would be very useful for rollercoaster-builders.

Also, maybe they could be diagonal-upside-down, kinda like how they go diagonal normally.

The last direction I would love to see is straight down. I think it would be really thrilling to go on a ride like that.

Maybe there could be “Sticky Rails” and you can use those for upside down, diagonal-upside-down, straight down, etc.