De Blasio and Sen. Chuck Schumer rode the train to get Congress to pass a long-term transportation bill.
Twitter user @darth was inspired to create a new sign to add to the MTA's courtesy campaign.
The man exposed himself to a woman on Valentine’s Day and to another woman on March 2.
The victim snapped a picture of the suspect on the R train before he fled.
The suspect squeezed into a turnstile with the woman and groped her, police said.
The Roosevelt Avenue station is the second busiest in Queens.
The suspect hit the victim in the mouth and the nose, and fled, officials said.
Lines affected are the 1, 2, 6, 7, A, F, G, Q, N, R and the Times Square shuttle.
MTA work will affect the 4, 5, 6, A, C, E, J, M, N, Q and R lines.
Construction and maintenance work will bring changes to the 6, A, C, E, F, G, J, L, N, Q and R lines.
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