Zombie train: endless express

A train has been created for the planet's elite and the necessary workforce.
This super express rushes along the railroad, which encircles the entire globe.
The rest of the population has been abandoned to its fate, forced to survive in the hellish conditions of the zombie apocalypse.
You are a resistance fighter.
"Track Workers," that's what you call yourself.
Your goal is to sneak onto the train and capture it.