This appears to have been a very well organised attack, firstly to know exactly when the train would be passing, then to arrange ground operatives to place explosives on the track, stopping the train, and thirdly following it up with HIMARS and Switchblade drone attacks to totally destroy it. Not only is the fuel it carried no longer available for Russian use, but it will take some time to clear and repair the tracks, especially if repair crews also come under attack. The video discusses the possibility that those who placed the ground explosives were partisan fighters, rather than Ukrainian soldiers. If so, then there appears to be a well organised resistance on the ground in Russian occupied territory, in communication with Ukrainian intelligence and supplied by drone drops.