[cr1895]

In fact, MTA have been investing in vacuum cleaning systems for the tracks with the aim of reducing fires that lead to delays. You're being disingenuous. Here's an article:

https://www.nytimes.com/2017/07/24/nyregion/with-new-vacuums...

So it's frankly absurd of the commenter to say that just 4-5 people could manage this task. One manager mentioned in the article leads a team of 300(!) cleaners.

[pravda]

That's the subway tracks. They are forced to clean debris off the subway tracks, otherwise the trains can't run.

But where the people are, the stations, they don't keep them clean. That's what the commenter was refering to.