This is a loop, right?

Don R...hope you can help me out with my reverse loop. I've installed isolated track joiners as the loop comes around and back into my turn out but the train just dies when it hits that section. I flip the reverse switch on the transformer and nothing happens.
Should I ALSO be installing insulators on the other side?

Thanks, Guys! Looks like I was isolating only one side of the loop! Thanks again!!!

Special thanks to Beepjuice and Don R for your help with this. I could swear that my last layout had a loop I was able to control by simply using the reverse switch on my Power Pac. Guess I'll have to install a DPDT switche to get this straightened out.

Also, please accept my apologies for any confusion I may have caused. Considering the original thread topic by Beepjuice, "This is a loop, right?", and the subsequent exchanges of information, I thought that my questions were relative to the conversation. Again, I'm sorry if I seemed to have hi-jacked the thread.