While standing today, I saw a perfect example of passengers speaking up and help enforce train rules. A woman in her 20s sat in the handicapped seat and pretended to be sleeping (or not, but she seemed to only be sleeping when we arrive at stations) when an elderly woman with a cane walked in. The train was packed. There wasn't barely any room to stand! It was almost too crowded to find space on a safety pole to grab on to.
The young woman had no intention of getting up whatsoever. Her eyes were opened but she kept her head down. Immediately, a man right around the area tapped her shoulder and said, "Please get up. There's someone disabled who needs to sit down."
The young woman was not happy but obliged. She pouted the rest of the way. I'm just glad someone spoke up immediately!