Shortly before reaching Hollins Ferry Road the WM's Tide block began and, per
the sign, operated under Direct Traffic Control or Direct Train Control (DTC).
Under the DTC system a dispatcher gives direct authority for a train to enter
a block of track via radio instead of via a train orders office. A "block" is
a length of track that per operational rule is to be occupied by no more than
a certain number of trains, often just one, so as to minimize the chance of a
Hollins Ferry Road was so busy as to warrant standard automobile traffic signals
(note them hanging at left and right) in addition to the usual ones of railroad
There is scant information online about Hollins Ferry and Hammonds Ferry, both of
which presumably carried people and goods across the Patapsco River before bridges
Currently, rail traffic between Locust Point and points northeast travels via
the Howard Street Tunnel. If that tunnel is closed an alternate route will be
needed. One alternate under consideration is the Locust Point Connecting
Track that would join here from the right.
Wikipedia's entry on DTC