Physics Peeps only

If u don't get this, TOOO BADDDD, ur fault for not doing physics
i have come up with a new modification to the principle of relativity
checkk itt
Principle of relativity states that no motion can be detected in an inertial frame of reference. thus, an external non-inertial frame of reference is needed riteeee??? WRONG!
heres my thought experiment.
Following up on einstein's thought experiment - train is moving in a speed of light, he holds up a mirror...will he see his own reflection? bladibladibla
anyways, say a person is sitting in the window seat of the train moving at even the speed of light.
Now, the person is able to see outside and he sees a rail that runs directly on the path of the train. The rail is uniform throughout the entire path of the train tracks, which means there is no imperfections and it looks the same. the principle of relativity states 1 frame of relativity, thus for this purpose the rail is enuf and the rest is just white sky and w.e.
so....if the rail looks the same throughout ur entire journey...and u can see outside...will u still be able to detect motion??
HAHA!
if u dont get it talk to me about it @ skool :)
LOL IM SUCH A NERD :P TEEHEE