點樣先可以令Simutrans鐵路進入地底？

You start by creating a tunnel that is 5 tiles long. Use the track removal tool to remove the unwanted end of the tunnel along with 1 more tile, to ensure that the entire tunnel is not removed.
Then, you can do whatever you like to the tunnel. You can use the terrain tools to create slopes. Also, be aware that the deeper you go, the more offset the tunnel is in relation to the ground due to perspective issues.

用手起

先搵位起竪井，將部砌好咗嘅隧道盾吊落去，再沿住你想起嘅方向一直鑽落去，打通晒之後隧道盾就長埋地底。

跟手鋪軌、電、照明，起月台站構，設置訊號。

最後出車行入去試，試完就通車

http://japanese.simutrans.com/index.php ... B#z2fd61af

唔知日文講咩就google 翻譯下