Yes! They are tricky, but you can fix them. I did it 3 weeks ago, 2 of them in 2 hours 😅
German instructions: https://youtu.be/_JPxOjBCwG0 Maybe you can understand, otherwise there are several videos on YT
I used black double strand from amazon (also in germany), which looks 95% the same: (copper, 0.14m^2)
https://www.amazon.de/dp/B002QE5OKY/ref=cm_sw_r_cp_api_i_pDrdGb925WVDQ
I've been really pleased with the Sprite World track from Amazon:
https://smile.amazon.com/gp/product/B06Y3NX97X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I have only bought straight track from them though. I have plenty of the other types.
There is this one brand on Amazon that I got because I had a train motor but nothing to run it on. https://www.amazon.com/Tracks-Non-Powered-Railroad-Compatible-Building/dp/B01N4IBP9H/ref=mp_s_a_1_5?crid=2SJ2VSU6DLR15&keywords=lego+compatible+train+track&qid=1660940600&sprefix=lego+compatable+t%2Caps%2C166&sr=8-5 When compared to lego, it works the same and is a bit more budgeted
Here you go. Seems the price has gone up by about a dollar
I know it's a bit late, but I had the same question so I put together this list. It's only trains released after 2000. Let me know if I missed any.
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https://listium.com/@Marc/42956/lego-train-sets-released-since-2000