I understand the frustration of having red cubes in your network with nowhere practical for them to go...
But that is what makes the red cubes so valuable. And you should always have access to NY, Chi or Charleston. I also love red cubes because when I see them I know they will be delivered for a lot of points. Its frustrating having a long 6 link delivery of a yellow cube but there is another yellow city only 2 short links away. This doesn't happen with reds.