We rode this train this morning. Went through transfer security and then to the train. It ran say from C1 - C12 which is where you get off for the D gates. I was glad I paid attention and happened to see the D gates. This is unlike DFW where you ride through all the gates at one terminal before moving onto the next letter. Most people familiar with DOH probably know this already but just wanted to share. And the new train was great btw. Now if they could just get NYC subways to look 1/2 that good we'd be in business.