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In the process of making more assets for my Model railroad I designed three walls and double track tunnel. these are modeled for N scale but you can scale them up by 190% in your slicing program and can use for HO/OO scale as well.
These tunnels are for straight tracks if you are using them on curve tracks then make sure increase the scale to accommodate the curvature for longer rolling stocks.
I have also added my tutorial on how you can make your custom walls and other objects using very simple techniques using Autodesk 3DS Max. so make sure to check that out.
Here is the link for the Tutorial - https://www.youtube.com/watch?v=pb4WU_6duno
I have also Designed Tunnel for Single track you can check it out here -
I will be posting more stuff for model railroad. so stay tuned. ask any doubts in comments.
Hope you will find it useful in your model railroad hobby.