So what? Now it isnt a key rail route. China will just redirect the rail route from other countries.Juat for starters Lithuania “was” a key rail route on the BRI, they literally just opened a rail freight facility to support it.
BRI is a long-term project. China didnt start this project hoping that everything would go well. It knew that there would be traps and machinations by the West. In fact I would say that so far, the BRI has been mostly unaffected by such schemes.
If the West thinks that BRI is only a 5 or even 10 years plan them they are mistaken. If you want to see a hint on how many years to the future China is looking, then just watch the BRI investments that China is making into Africa.
Lithuania and other such US puppets can do whatever they want. China never shackled them.It can use it’s influence around the Baltic Sea to support Washington, and it’s an admired little country that’s doing well for itself.
However, that means China can also do whatever it wants. Now depending on how much such, US puppets take actions against China, then China will respond accordingly.
It seems to me that you mistakenly believe that China response toolbox is "only" limited in the economic sphere. I wont say much but you can be sure that China and Russia can act accordingly if necessary