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designated and recommended by the engineer, and adopted
by the President and Directors of the Baltimore and Potomac
Rail Road Company. The other bridges on the said roads
shall be constructed in like manner and with the same mater-
ials used by the Baltimore and Ohio Rail Road Company in
their construction of bridges of like dimensions on their
said road, unless, as before specified, the engineer of the Bal-
timore and Potomac Rail Road Company shall recommend,
and the President and Directors thereof shall adopt, some
equally substantial plan of stucture.

Sixthly. That they, the said parties of the second part, will
place on the said roadway, after the same has been graded as
aforesaid, cross-ties, to be laid two feet and two inches from
centre to centre and firmly bedded, to be of such size and ma-
terial as the engineeer of said road shall approve. The spaces
between the ties to be filled with ballast formed of gravel or
broken stone, which is to extend one foot beyond the ends of
the ties and along the ends thereof. The rails are to be laid
of the common gauge of four feet eight and a half inches, and
fastened to the cross-ties by spikes of such size and shape as
the engineer shall recommend and the President and Direc-
tors of said company shall approve. The joints of the iron
rails are to be secured in the same manner as they are upon
the Washington Branch of the Baltimore and Ohio Railroad.
The rails are to be of the H or T pattern, and of the weight
of not less than fifty-six pounds to the yard. The two rails
are to be laid at the same level, on straight lines, but on
curves the outer rail is to be raised as much higher as the en-
gineer may direct, reference being had to the radius of the
curve. Sidings are to be made in such places, and of such
extent as shall be directed, and are to be constructed in the
same manner as the superstructure of the main track; and
switches and fastenings are to be on the plan of those now in
use upon the Washington Branch of the Baltimore and Ohio
Railroad Company.

And it is further covenanted and agreed by and between
the parties, that the parties of the second part shall com-
mence the said road at the point of crossing of the Annapolis
and Elkridge Railroad, on the south side thereof, and running
thence towards the Patuxent river, as soon as practicable
after the signing of this contract, and shall completely grade
five miles of the said road within six months from and after
the date of this contract, and shall further completely grade
five miles additional on the route to Marlborough within
every six months thereafter until the said road reaches Upper
Marlboro'; and in case the parties of the second part shall
not commence the said road as hereinbefore required, and
completely grade five miles of the said road within the said
six months from the date of the signing of this contract, the
parties of the second part shall forfeit and pay to the Presi-