Trains going underground

[Jochem_LEGO]

Hello, I want to have my trains going underground in My City.

My plans are to make a tunnel that Goes down in the Road. So I do not have it going over my Harbour area

to go Under the table, But do not know what the maximum incline can be. And it this is possible.

other suggestions are welcome too.

[FGMatt]

I think that a generally suggested maximum is one plate in height per track width; but in a layout that size you might struggle with something so restrictive (I'd think you'd want at least 20 plates in height even if using London Underground-style low trains) which would mean an incline taking up the full width of your layout. 

So a good starting place would be to do some testing with the trains that you have in mind to use, and see what sort of inclines they can comfortably handle.

 

The obvious alternative is just to have an underground railway on the level, and adjust parts of the town around it - maybe raising up part of the street level to get the trains under it?