I bet the El is just a bit overwhelming, what with all the REALLY loud screeches, rumbling, and all the people.
A year ago we took DS to a big and crowded party and had that exact same experience (non-stop crying near the people, wanting to inappropriately run around etc.). It was just a bit freaky to him - and usually he loves parties!
Even though your DS loves trains, it's probably a different experience being on one, especially the rickety old El. We live downtown but I've never taken my guy on the El (to my shame!) for fear of having your experience.
A year ago we took DS to a big and crowded party and had that exact same experience (non-stop crying near the people, wanting to inappropriately run around etc.). It was just a bit freaky to him - and usually he loves parties!
Even though your DS loves trains, it's probably a different experience being on one, especially the rickety old El. We live downtown but I've never taken my guy on the El (to my shame!) for fear of having your experience.