Underground Metro

[severe quiver]

My city now has 50k cims and its growing very fast. I tried to build an underground metro but I don´t know how. Can someone tell me?

[small pond]

Build stations at busy areas (high density, airports, train stations, unique buildings). Connect them so as few transfers as possible needs to be made

[primal needle]

i have my metro at s stoo for basically every important area

i have it in my industrial

i can send a map of my metro system it works very well

[bright field]

Step 1 > Built Metro stations (of whichever type is best suited) at key locations to provide access to high-traffic destinations
Step 2 > Connect the stations with Metro rail lines; loops generally work best though, sometimes, spur lines are more appropriate
Step 3 > Use the service lines (the little bus-stop-looking icon in the Metro tab) to set up the routes; click at one station to start a new line, then at each station where you want that line to make a stop, finally connecting back to the first stop
After your cims have time to start using the lines, adjust the budget/funding to provide enough service for the number of travelers; aim for 125%-150% of usage so there's capacity to handle fluctuations.

[severe quiver]

Yes I know how to build a metro over the ground but my question is how to get the track go under the ground?

[small pond]

Oh, then just press page down a few times until you're underground