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@Foxunitone Love this mod.
you can add traintracks.xml and trains.xml into your custom DLC (with only custom entries, without vanilla configs)for example - https://www.mediafire.com/file/cro5wpk6b6ohgvm/kitsunetrains.rar/file
Tested in game trains spawns fine, sometimes vanilla train shows upon oposite track at same time but this can be fixed, also its include ny_test.dat track for example as custom addon track but to enable it u need use native Function.Call(Hash.SWITCH_TRAIN_TRACK, 12, true); -> 12 is index of exact track which you want to enable (from traintracks.xml - vanilla got 12 tracks so indexes count from 0 to 11, from custom traintracks indexes continue count from 12 to +1 for every added new track - with this way you can enable/disable vanilla or new addon train tracks

@Foxunitone you dont need to make separate clip dictionaries for each entity, all can be stored in one ycd...