Help with creating an Y intersection

Hi there.
I’m working on Half-Life remake for Fallout 3 game and I’m trying to make an Y intersection from this piece of original mesh without harming an UV layout:

http://s9.postimg.org/vyx2a9y3f/Bez_n_zvu_1.jpg

For better understanding there’s video that depicts exatly what I’m trying to achieve:

https://youtu.be/mTKMQlZt5mc?t=184

On the video you can see that rails are going left…

\|
 |

… but I think I’ll need the “right” version too:

 |/
 |

I uploaded a *.blend file with both textures so you can look at it if you have some spare time.

Regards.
A.

Attachments

y.zip (1.18 MB)