Blazing trains, burning tracks, black smoke.

Footage posted online by Ukrainian fighters documents their repeated sabotage attacks on a vast railroad system being built by Russia across the occupied territories of Ukraine. But their efforts are not nearly enough to hold back the tide of Moscow’s rapid industrial expansion.

The attacks on Russia’s supply chains have made scant impact, and tightening Russian control is snuffing out opposition efforts, said one Ukrainian fighter, Orest, using his military call-sign for security reasons as he operates ?behind enemy lines in the Donetsk region. “The railroad is hundreds of kilometers long,” he said. “We’re not all-powerful, unfortunately.”