The key is at the top. Blue line is 2019, green is 2020, gray is 2021, yellow is 2022, red is 2023, and purple is 2024. Chart represents the rolling average daily loading of the russian railways, by millions of tons. 2020 and the first half of 2021 are outliers due to covid-19, so we have to look at 2019 and the latter half of 2021 for the normal pre-war baseline. 2022 and 2023 are much lower than 2019, but they're at about the same level; and then 2024 is much, much lower. So much so that the highest point of 2024 is below the lowest point of 2022.
Things keep working just fine until they don't. And when they start to stop working, you get a cascading effect. Less locomotives means the remaining ones have more work to do, so they wear out faster, which leads to even less locomotives, and so on.
Meanwhile, all the money that's not going into poo-tin's palaces is going into buying chinese bikes to equip russia's yolo cavalry. There's no money to fix broken stuff in russia. So you should expect the curve for 2025 to be even lower than the curve for 2024, and the one for 2026 will be even worse.
And trains are the backbone of russian logistics. They don't have reliable highways for truck logistics. The country is just too large and too sparsely inhabited for road-based logistics to be viable; only railroads are cost-effective enough in these conditions, but russian railways is a poorly-managed monopoly that the russian regime is extracting money from, so there's no funds for maintenance of the infrastructure and rolling stock. This is another self-inflicted wound.