How will be handled render meshes of block? Force "use render mesh of the linked block"?

Rhino Rhino for Windows
1

Hi,

I have a complex train model, file size 700MB. I need to place the train two times at the scene and so I use it as block. I would like to avoid that every time I open the main file, that the blocks get remeshed. How can I force that blocks are no remeshed and the render mesh of the block file is used?

Ciao,
Micha