programmable cart (turle-like)

I actually pisplaced this before but here it is again.
It's not the same as a few topic's back…


I would love a programmable cart/train

maybe combine a turtle and a cart
or chest-cart with turtle for a extra non programmable storage

i like steve carts but it's a pain to use it with CC

turtle.rail() to see if there's a rail infront of it (so it can deploy one if needed)
it would use the fuel like a turtle

or a commant that would mount the turtle to the cart like
turtle.mount()

Please let me know if this already exists.

I would really love to be able to Program a cart/train instead of hoping it will do what i want it to do.

and if possible a way to sit in it would be really nice.

You can already lay track with turtles, and you can make carts move with a redstone signal to a powered rail on an incline.