Trainlady, also known as Antarctic Express Mini, is a train service that runs through part of the Antarctic Express track. Its main purpose is to provide an extension arm to the main Antarctic Express, although in recent times, it has been reported to have built its own railway track. The whole railway line that the Trainlady service runs on, including railway tracks shared with its counterpart, is shaped like the letter 'U' from an aerial view. No one really knows why.