Did William Coggeshall Save Lincoln's Life?

[Eva Elisabeth]

In my second sentence I repeated the request of someone please describing the modus operandi. Where was the attacker when he threw the granade, where did he go?
Were the trains in a station? Then someone should have witnessed the explosion. Also if the train(s) weren't moving there was probably little to no engine noise. And how would the grenade have "struck behind"?

"Changing trains" here sometimes also refers to changing cars of moving trains when some cars would be detached in the next station and attached to another.