help i do not know how to isolate the loop
crossover marked red
That’s one complicated piece of trackwork you have there. If you go to your album and at the top right next to copy, hit the arrow and get share links and copy the BB code, and put that in your post, we can see your pic directly without going to Imgur
http://www.wiringfordcc.com/switches.htm
A little over 1/2 way down the page.
It looks to me like Kato only makes double crossovers in N scale: 20-210.
I did some looking on the ole internet. It seems that if you are running DCC, the hookup is trivial.
If running DC, this might help:
http://www.jnsforum.com/community/topic/9745-kato-double-crossing-wiring-question/
Ed
Your question is a bit cryptic. At the most basic level, sections of Unitrack are isolated with insulated UniJoiners.