So I'm reading the book "The Bloody White Baron" by James Palmer which is about the rise and fall of Baron Ungern Sternberg and his misbegotten attempt to take over Mongolia at the end of the Russian civil war. In one of the chapters on that war, I came across an incredible description about the use of armored trains during the Russian civil war. I will quote it in full here because it's really something

“Armored trains were the dreadnoughts of this war. Huge and expensive, they could bring a devastating amount of firepower to bear-albeit upon a necessarily limited area. Three standard types of armored train had been manufactured during the war, but in Siberia many of them were unique, improvised creations; engineers took an ordinary train and bolted great slabs of steel to its sides as armor, then took whatever guns could be found and attached them to the roof of the carriage. Some were merely semi-armored, their wooden carriages reinforced only with bricks or sandbags- enough to deflect rifle bullets, but useless against artillery.

Most comprised eight to ten carriages, but they could be much longer. Their modular nature made for both flexibility of purpose and ease of replacement; damaged rolling stock could be cannibalized for spares. Some of these snaky juggernauts were painted in camouflage colors, greens and browns, while others were liveried in menacing black. Churchill wrote of armored trains that ‘the very name seems strange; a locomotive disguised as a knight-errant, the agent of civilization in the habiliments of chivalry’, but there was nothing either civilized chivalrous about their use in the Transbaikal. Semenov’s trains had no effective opposition, and to be the commander of one was like being captain of a pirate vessel; one could simply roll into a small town and demand the locals either hand over whatever they had or be blown to smithereens. The Reds strove to set up their armored train crews as a trained, organized force, and tried to use them as massed artillery. In contrast, Semenov’s captains recruited or pressganged their own men, often acting on their initiative rather than any higher orders. Crew sizes ranged from forty to nearly two hundred, sometimes with an auxiliary infantry force of two or three hundred men. Many were armed with naval artillery, stripped from the boats of the Siberian lakes. They were given names fit for machines of mass destruction; the Reds had the ideological Death to parasites, Ruin of the Counter-revolution, Liberty or Death, while among the White trains in Siberia were the Valiant, Swift and Just, along with the more aptly named Master, Avenger, Destroyer, Terrible and Merciless.” From The Bloody White Baron by James Palmer. Chapter 5: Carrion Country, page 104

What I was wondering is how they kept up the maintenance of the train tracks? Were trains an at all effective weapon during the Russian civil war? What kept the train tracks in Russia from being damaged so consistently that train use simply wasn't possible? After all, I know that during other wars of the industrial age, train tracks were frequent military targets. (Sherman's neckties being one famous example)