Save File crashed if add Jurassic Park Tour rail tracks?

Hello all,
When I set up Jurassic Park tour tracks, then I'm done. I saved it and later loaded it. Crashed. If I revert to my old save file without Jurassic Park Tour tracks, I'm all good. The old save file has a few Jurassic Park Tour tracks. The new one has full Jurassic Park tour tracks. I have 40 GB of RAM and memory is 32% utilized. After I revert back, I built tracks again, still crashed.

Any advice?

Thanks
 
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