One of the absolute best things about my GH4 is the tilt and swivel touch screen. I can be sitting quietly in my seat looking down into my lap and if I’ve turned the screen just so, I can get close ups of people near me without attracting attention.
This young lady was napping almost directly across from where I was sitting. She would doze off and then snap awake suddenly as the train lurched. By paying close attention, with my finger on the shutter button, I got a number of pictures of her with her eyes closed. The standing passengers would occasionally get in the way but there were enough chances to finally come up with the one above.