Privet Mishau
I take "L'Enfant Plaza, connection all stations" as "At L'Enfant Plaza, you can make a connection to all subway stations in Washington DC". Here "connection" is "shifting from a subway line to another subway line".
Please note that all of Washington's subway lines (except the red one : maybe it was not available when Dan Brown wrote the phrase) run through L'Enfant Plaza.
http://commons.wikimedia.org/w/thumb.ph ... .gif&w=500
paco
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In Japan today even dogs are learning how to bow-wow in English.