@kilroy70 said
"If you are an observer on the front of the train, you would see a headlight normally"
The train is already traveling at c. So in order for an observer on that train to "see a headlight normally" photons from the headlights would have to be traveling at twice the speed of light.
But if that train was traveling at 99.9999% the speed of light then yes, photons emanating from the headlights could be observed traveling away from the train at c.
Relativity seems to be a misunderstood term, I guess.
Everything is relative to the observer's frame of reference.
An observer ON the train is hard pressed to tell if the train is moving, or if the environs is moving. As far as he can tell, the train is traveling at 0, especially at 0 acceleration. Add the speed of the headlight, c, and 0 + c = c.
I'm definitely not going to talk about time dilation in this environment, since it is even harder to grasp. Lorentz-Fitzgerald transformations, etc.