1831 B & O survey of route for the first rail road line

The first passenger and freight railroad ran from Baltimore to Ellicott's mills (Ellicott City).  The tracks headed south out of Baltimore to run along the Patapsco River mills (Avalon mill at Elkridge, Md) to Ellicott's mills.  From the 1831 Ellicott mills rail road station (the oldest rr station in America, now a museum HERE) the route ran west along the river then to Frederick.

Quarries near Ellicott City

The Catholic Cathedral and many homes and business in early Ellicott's mills were built with Ellicott City granite from nearby quarries along the Patapsco River.  The following excerpts describe the slight difference of the rock found on either side of the river and the quarries in 1811, 1834, 1898 and 1910.