Trying to script in a waypoint to change speed

[outer surge]

#1020374354867007528
I ’m trying to make a train and inputting a waypoint to speed, stop, etc. I’m new to scripting so I’m just trying to stick pre-existing scripts together. When I run it the main body doesn’t move, does anyone have any idea on how to fix this.

[thin heart]

your ends are all messed up

while do is suppoesed to have an end
if is supposedto have an end
function() is supposed to have an end
on the last three lines do

    end
  end
end)