I found the dll file and put it in the:The DLL must have the exact name: "msvcp140_atomic_wait.dll" and be copied in "C:\Windows\System32" and "C:\Windows\SysWOW64", not in TRS22 folder (it is different from "msvcp140.dll"). You may have to manually register it; if so follow this guide.
C:\Program Files (x86)\Steam\steamapps\common\Trainz Railroad Simulator 2022
Eventhough it worked for me, should I have put it in the two ( System32 & SysWOW64 ) locations you suggested instead?