were there any accidents happened at the subway?
Yes - 64 major train accidents since 1918;  The 1995 Williamsburg Bridge crash; and  derailments have also taken place
New York City Subway
Despite the signal system, there have been at least 64 major train accidents since 1918, when a train bound for South Ferry smashed into two trains halted near Jackson Avenue on the IRT White Plains Road Line in the Bronx. Several accidents resulted when the train operator ran through red signals and rear-ended the subway train in front of it; this resulted from the signaling practice of "keying by", which allowed train operators to bypass red signals. The deadliest accident, the Malbone Street Wreck, occurred on November 1, 1918 beneath the intersection of Flatbush Avenue, Ocean Avenue, and Malbone Street (the latter of which is now Empire Boulevard) near the Prospect Park station of the then-BRT Brighton Line in Brooklyn, killing 93 people. As a result of accidents, especially more recent ones such as the 1995 Williamsburg Bridge crash, timer signals were installed. These signals have resulted in reduced speeds across the system. Accidents such as derailments are also due to broken e
where is nostrand avenue station (ind fulton street line) located? Bedford–Stuyvesant, Brooklyn, New York City what does the mentioned street line signify? It is a rapid transit line of the IND Division of the New York City Subway.
wiki:19918535
New York City Subway [SEP] Train accidents
Despite the signal system, there have been at least 64 major train accidents since 1918, when a train bound for South Ferry smashed into two trains halted near Jackson Avenue on the IRT White Plains Road Line in the Bronx. Several accidents resulted when the train operator ran through red signals and rear-ended the subway train in front of it; this resulted from the signaling practice of "keying by", which allowed train operators to bypass red signals. The deadliest accident, the Malbone Street Wreck, occurred on November 1, 1918 beneath the intersection of Flatbush Avenue, Ocean Avenue, and Malbone Street (the latter of which is now Empire Boulevard) near the Prospect Park station of the then-BRT Brighton Line in Brooklyn, killing 93 people.