How do I get to the Mojave Wasteland?
FOR USERS WHO ARE FINDING THEIR WAY BLOCKED WITH RUBBLE: please download the plugin that is attached to the end of this post, which has been provided by our very own sesom. You may view his post here in the thread as well for more specific instructions on how to use it and where to place it in your load order. It goes last. Save BEFORE entering the metro after activating, then continue.
Tale of Two Wastelands begins in the Capital Wasteland in much the same way as Fallout 3 does. You bear witness to your own birth and 19 years later escape Vault 101 to become The Lone Wanderer. At some point, however you've decided that it's time to grow up and to move out West. Dad's probably just fine, anyway.
So how do you get there?
By taking the train, of course! All you need to do is reach Union Station which is in the middle of the supermutant-infested DC ruins.
First, from The Mall make your way East towards the Capitol Building then North towards the National Archives.
To continue on to the station, take the exit at the end of the tunnel to Judiciary Square Metro (yes, this is a new area) which will lead you to a new DC mall area. With a little bit of exploration you will find the station building.
Additionally, here is an overhead composite map of the layout of The Mall with the Penn. Ave./The Mall dungeon highlighted in yellow.
Disclaimer! Like most places in DC, the station can be a very challenging or downright dangerous place for low-level characters.
How do I get back to the Capital Wasteland?
Things didn't really work out for you. Getting shot in the head was a real wake up call. It's made you realize some things and now it's time to pay a visit to the homestead. Could it be that train you took from DC to New Vegas all those years ago is still running?
It sure is! That old train station is still in Freeside where you first got off it all those years ago. Maybe you don't remember where it is on account of recent events having to do with your noggin.
To get to the train, travel to Freeside North and head over to the Mormon Fort.