Long term, Ukraine needs Western support to continue and Russia can count on Chinese support as well as their own larger MIC. Without significant long range missiles to lay some hurt on Russia, Ukraine will be in trouble.
I think even with some long range missiles Ukraine will be in trouble. There's little evidence that long range strikes have a big influence on the course of the war.
This railway is in Poland. That is unprecedented.
The Nordstream sabotage was in international waters. Also, the Russian state owned >50% of the stock in the pipeline, & was at war with Ukraine. Poland is not at war with anyone. And the pipeline was not being used, & a non-Russian alternative was due to open next day. It didn't damage anyone economically at the time, though it could potentially have been damaging if the war had ended quickly.
It isn't though. We've had vague accusations of Russia being behind explosions at western military industrial facilities, and behind drones spotted near an airport. Now we have vague accusations of railway sabotage. If we believe these accusations then Russia has been active in EU countries for a while. If we don't, then this is hardly anything.
What's worse, complicated logistics or no kit? Uniformity is great in a perfect world but in a desperate wartime situation....
Of course Ukraine would rather have then not have. But operating technology requires support, maintenance, and in wartime repairs and replacements. Having a mix of different things is inconvenient but it gets worse when the mix is getting whittled down in all categories. And it's likely that for some types you simply won't get enough parts, and won't get any replacements. This applies to all kinds of equipment, including locomotives. The more types are in service, the more complex it is to keep all the types working. So even with a mix of western locomotives replacing Ukraine's own fleet, it's likely a mixed fleet will operate worse. And there's the matter of declining foreign support. If that support can be focused on military assets, that's one thing. But if it has to be stretched to energy infrastructure support, rail logistics support, economic support, and then also military aid...