DC to Boston by Local Transit

Adam (aka AdamDoesNotExist) is at it again, traveling from Washington DC to Boston via only local buses, regional trains, and ferries. Previously we covered his San Francisco to Seattle trip. DC to Boston takes 3 days via local transit, vs 6 hours via Amtrak Acela.

Part 1: Washington DC to New York City:

Part 2: New York City to Boston:

This is an open thread.