It's only vanilla problem that vanilla don't have a lot of useful things and nobody plays in vanilla. All modern patchpacks/forks support 64 or at least 32 slots.
Therefore, a useful GRF should, at least provide such an opportunity.
The overwhelming majority of OpenTTD players use vanilla. There are only two patch packs which currently support 32 tracktypes, which I'm sure they're going to update to 64 in the future. But there are many packs and forks which will not.
…from 3 total. But Spring is outdated (abandoned?).
Of course, there are also many of special forks to support individual patches. But they in any case should not support anything, except their patches.
As kamnet stated before, 64 track types are not in vanilla OTTD yet. As long as it is like that, adding 3rd option won't have high priority for us. Just don't make them run on other rails if you don't want to.
Meanwhile new liveries were added for ED9M and new ones for ED4M will be added soon.
This being said, JGR's patchpack allows up to 64 railtypes in OTTD. No need to compile anything, just install, extract and launch.
If ever you want xUSSR trains to run on standard gauge, disable the xUSSR tracks.
…and have problem with every GRFs with provided both standard and broad gauge tracks.
And yes, now Soviet set has problem witch these sets too. Not only with 32-64 tracks builds.
Other than xUSSR there's no such thing as a track set providing broad gauge tracks. A lot provide narrow gauge tracks (French Track Set, Japanese Track Set) but none other than this one provides broad gauge.
Most other sets, like the Spain Set or Finnish Trainset assumes the rails you use are broad gauge. But looking at all the different broad gauges, if we had to make all of them different because of the few centimeters they don't have in common, we would be dead before finishing.
When I use this set, I always get question marks on some of the letters in the name of the trains and wagons.
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Can we get an official release page for this so those looking don't have to sift through it?
It depends on what official page is.
Just in case you missed it, 1.9.0 beta 2 is out, and now supports 64 track types.
Load this set and, for example, Dutch trains/tracks.
German trains cannot access to xUSSR rails. It's good.
However, in Soviet Russia trains don't care about gauge width and use German (Japanese, American, etc) rails as well. It's not good, I think.
It's works, but it's not good.
Best solution - make this behavior optional.