My buddy Blair’s younger brother Mark boarded a commuter train in Sydney recently, which promptly parked in a holding tunnel, stranding him for five hours plus. It’s gotten a fair amount of attention in local news outlets, mostly because of a colorful and oft hilarious e-mail Mark sent to his employer to explain the situation — an email that he couldn’t send because he was stranded in a railroad tunnel. (Warning: includes the language of a guy stranded on an empty train for half a day.)