[TOMT] TV show / episode / video where they talk about the speed of light being constant by using a train moving at the speed of light

Physics video in the style of ‘Through the Wormhole’ (Morgan Freeman) or ‘Cosmos’ (Neil deGrasse Tyson)
I saw this video at least 7-10 years ago.

All i remember was the video was trying to show how the speed of light was always constant no matter what perspective you were in, and you could never surpass this cosmic “speed limit”. It used a visual analogy of a train traveling around the planet at light speed. On the train, there was a child that decided to run forward. Now, the child SHOULD be going faster than the speed of light, but since we can’t go faster, the child seems to move in slow motion as to not break this cosmic speed limit.

I feel like it was narrated by a famous physicist or voice actor as mentioned above.

I’m familiar with the concept but it’s this specific video I am looking for. Hoping someone else remembers this and has seen it.