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Get up on the roof of the carriage station and you can access the 2nd floor of the carriage station via an open skylight window. Just be careful as two guards show up via a carriage to stand guard up there. Also if you get around the back of the carriage station you can access it via rat tunnel that is back there just to the right of the back door to the carriage station. Use Possession as Corvo or Shadow Walk + Rat Shadows as Emily. Or either in NG+.
If you want to know how to clean up the Howlers back there you can take a look at these:
As Emily - https://www.youtube.com/watch?v=8ZnIT3eD9d0
As Corvo - https://www.youtube.com/watch?v=m_-4TL_CGgs