The most crowded New York subway in the United States The train delay decreases the number of trains Stuck in a state

The most crowded subway lines in the US are New York'sIRT Lexington · Avenue LineEspecially when the commuter rush in the morning comes, even if the train comes, it is full and we have to see the train. The New York Times investigated this situation, and it turned out that the train of the Lexington Avenue line was not running as planned, but also operated with fewer trains than planned.

New York's Subways Are Not Just Delayed. Some Trains Do not Run at All. - The New York Times
https://www.nytimes.com/interactive/2017/08/07/nyregion/new-yorks-subways-are-not-just-delayed-some-trains-dont-run-at-all.html

Below is a graph showing the operation of the trains at the 4th, 5th and 6th homes of the Lexington Avenue line by the investigation of The New York Times. The dotted line indicates the scheduled number of operations, and the gray indicates the actual number of operations. I can not operate with scheduled number of passes throughout the whole time zone, and the more rush hour in the morning and evening, the fewer the number of trucks are scheduled than planned. According to actual driving conditions, the number of passengers will be reduced by about 1000 people from the planned number.


Furthermore, the graph below shows the planned number of rush hours in the morning and evening and the actual number of operations, and I also know that the day the train reached the planned number at the time of the weekday's rush in the last two months was zero.


About this situationNew York Metropolitan Transit AuthorityAlso acknowledged the fact that it was not able to operate as planned, and it seems that complaints are coming out as passengers are overcrowded on a small train. According to the official announcement of the Lexington Avenue line, the cause of such a delay is that the old signaling system of the New York subway line, which has a history of more than 100 years, can not respond to the current situation, and passengers on overcrowded trains get on and off We are announcing that it is due to not being done smoothly.

It seems that the Lexington · Avenue line is trying to shorten the train operation interval, but in fact the actual number of traveling trains has been steadily decreasing every year since 2012. The signal system in the 1930s currently used in the Lexington Avenue line seems to be a barrier to shorten the train operation interval, but in order to change the signal system of the whole route to the latest system, It is expected to cost more than a year and billions of dollars.