rsn8887 has updated the Port of Open Transport Tycoon Deluxe for the Nintendo Switch:
Installation
Download (see assets below), and unzip openttd_switch.zip and copy the contents over to the /switch/ folder on your sd card, so that you have a folder /switch/openttd with many folders and files inside.
Use you favorite homebrew launcher to start the game. It comes with everything you need to start playing right away.
Note: This game takes quite long to load (~15 seconds). But it is worth the wait!
The public domain graphics and sound sets from www.openttd.org are included.
If you want the choice to also use the original dos game graphics and sounds, copy over the files