1. Walk slowly to the platform entrance, then stop right at the narrowest point. You can stare off into space, take out your phone/iPod, or just do nothing. It helps to also wear earbuds so nobody can communicate with you. The key element is: keep your back to everyone and do not let anyone get by you.
2. As the train approaches, walk directly up to the door before they open.
3. When the doors open, shove your way on as quickly as possible. Do not let anyone off the train. The doors might close before you can get on and you will be stranded on the platform until you starve or succumb to the elements.
4. Take one step inside the doors and stop. You are the only person getting on the train, and the doorway is your own private standing space.