Can you give me and my gun a ride to Washington, DC?
A brilliant taxi driver knew the answer, which WTF? No! So the taxi driver drops him off at the train station and calls police instead.
I can just hear the 911 call now:
911: “What is the nature of your emergency?”
Taxi driver: “Some dude with a gun asked me to drive him to Washington, DC.”
911: “Did the passenger fail to pay you?”
Taxi driver: “Excuse me!  He had a gun.  A big gun.”
911: “Ah, I see.  What kind of gun do you have sir?”
Taxi driver: “I don’t have a gun.  I kicked my passenger’s ass out of my car and his gun.”
911: “Where did you lose your gun, sir?”
Taxi driver: “click…”

Fortunately, someone saw the gun on the train with the gun and called 911 again.  It seems that they were more persistent this time because police captured the man on the train and found the gun, in the said sheet.  The perp broke his ankle trying to escape by presumably jumping from the train.

So the perp has his gun wrapped up in a sheet.  I know a sheet is the first thing that comes to my mind when thinking about a way to hide a gun on a train.  And if I’m on a train, an object like that wrapped in  a sheet always allays my suspicions.

What a dumbass!