Showing you how to follow the Freedom Trail in "Road to Freedom" and "The Molecular Level".
Collecting all the Numbers and Letters at the Trail:
7A / 4L / 2A / 6O / 3I /5R / 8D / 1R = RAILROAD
Enter the password at the end of the corridor at the church and the door opens.
The Freedom Trail in Boston does exist. It is a 2.5 mile long path through downtown Boston marked through a red brick sidewalk and Special markers. In real life it covers 16 historical sites, in the Game a lot of them are buried under rubble, e.g. Park Street Church. In game it also already ends at Old North Church instead at the Bunker Hill Monument.