The question relates to the history of urban transportation infrastructure in New York City. While referencing the move from street trolleys to subways in cities, it lacks specific details regarding the street in question for the NYCTA tunnel.
The question pertains to the history of urban transportation, specifically the absence of a rapid transit tunnel under the East at a particular street in New York City. The historical context provided indicates the transition from horse-drawn carriages to trolleys and eventually to subways. It highlights the challenges, such as congestion and accidents, that led to trolleys going underground.
For instance, Boston's Public Gardens Portal is mentioned as a point where multiple trolley lines converged to enter the United States' oldest subway tunnel, the Tremont Street Subway, which opened on September 1, 1897. This exemplifies how cities adapted their transit systems to avoid overcrowded streets. The question, however, seems to be missing specific details, as it does not provide a street number to accurately pinpoint which tunnel is missing under the East street in NYC.