the general manager in boston at there and i am aware of the operating practices there, and it's beston and pick the government center and the green line -- several lines go into the green line and trains frequently switched there. that is just one example. we also reached out after we saw the initial report that said that others did not do switchbacks. we reached out to other transit systems that we listed in our response that owls do switchbacks so again the same caveat. all of the other transit systems will tell you would they prefer not to do switchbacks? yes they would. in some cases, in the case of bart they have tracks and they can do other things but they also do switch backs and schedule them everyday as well, so in our view and base some of our personal experiences and discussions with others, other systems do use switch backs. >> okay. maybe i will ask the grand jury this as well, but from your point of view were these not jurisdictions communicating to them during the course of their investigation? >> i did not see that until the finding so we were briefed on the findings an