I joined Bobby's group when I was living in Toronto earlier this year, and now that I am back in the States, I am an official "franchisee", with my own sketch group. I'm not alone, there are "Subway Sketch Groups" all around the world. Check out the master thread at CGTalk.com:
http://forums.cgsociety.org/showthread.php?t=247487
Here are some samples from my own Detroit sketch group, in click-able thumbnail form:
![Image](http://www.tom-dow.com/images/lj/050505_subway01thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/050505_subway03thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/060505_subway03thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/050505_subway05thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/062705_subway02thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/062705_subway04thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/080205_subway02thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/080805_subway02thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/081405_subway03thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/082805_subway02thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/091805_subway01thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/100205_subway01thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/101605_subway01thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/101605_subway02thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/102305_subway01thmb.jpg)
![Image](http://www.tom-dow.com/images/lj/102305_subway02thmb.jpg)