Conversation so far:
who did Edwin Booth save?
Abraham Lincoln's son, Robert, from serious injury or even death.
where did this happen?
The incident occurred on a train platform in Jersey City, New Jersey.
What caused this?
The incident occurred while a group of passengers were late at night purchasing their sleeping car places.

Question: What happened next?
Self-contained rewrite: What happened after a group of passengers were late at night purchasing their sleeping car places?