The Atlantic's CityLab blog, of course:
For all the monorail enthusiasts out there just now learning that New York once had its own single-track wonder, put your excitement on hold. For on this date in 1910, during its inaugural journey, the monorail lurched over, sending scores of people to the hospital.
The painful incident can be traced to the slick salesmanship of one Howard Tunis, who did so well demonstrating his novel design for an electric monorail at a 1907 exposition in Virginia that he gained the attention of the Interborough Rapid Transit Company. The IRT, the original operator of New York's subway line, asked Tunis if he could assemble a similar prototype for use up north. That the inventor did, and soon enough it was ready on a track stretching from a railroad station on the borough's mainland a short distance down to City Island.
Now, if I only had time to read the article...