Step by step instructions for how to get FROM the Amtrak platform(s) TO the New York City subway when you arrive at New York Penn Station.
How to buy a metro card:    • WALKTHROUGH: Amtrak to the Subway @ N...  
To the A, C, and E trains:    • WALKTHROUGH: Amtrak to the Subway @ N...  
To the 1, 2, and 3 trains:    • WALKTHROUGH: Amtrak to the Subway @ N...  

This is my first TRANSIT TUTORIAL. NYC has a massive and complex transit system, so I thought I would start offering step by step walkthroughs.
What transit tutorial you would like me to do next! Leave a comment.
I plan to make them much streamlined and cleaner as I figure this out.