"Incline" portion of the Granite Railway, Pine Hill Quarry to Neponset River, Quincy, Norfolk County, Massachusetts.

What is believed to be the first recorded railroad accident in U.S.
history occurred when four people were thrown off a vacant car
on the Granite Railway near Quincy, Massachusetts.

The victims had been invited to view the process of transporting
large and weighty loads of stone when a cable on a vacant car
snapped on the return trip, throwing them off the train and over
a 34-foot cliff. One man was killed and the others were seriously
injured.

Granite Railway memorial in East Milton Square.