Dream About Zombie Apocalypse On A Train

I was catching a train when a zombie apocalypse happened. I had seperate the train cart and there were 4 people in the back, so I ran to them. When I reached the people and turned around, I noticed that there was an injured person on the other side. Her right leg was missing and she was bleeding a lot. I let her sit down and I treated her leg. When I was done, I locked back of the train cart and noticed that there was a buff zombie running to us. I looked in front of the train cart and noticed 3 running zombies heading towards us. "Does somebody have a gun?!" I announced. Luckily a guy handed me one and I checked if there were any ammos left, and there were. But then a hit of late realization hitted me. When I looked out to see those zombies, we were high up in the air. I looked out the window and of course, we were high up in the air. I look out of the train cart doors and there were railways. I looked ahead of us and we were heading straight to a building, an apartment in fact. I looked out of the window again and saw a big field of tall grass. The 4 zombies ahead and behind us were gaining speed and I had to do something. And a choice was made, I let the 5 people get out of the train while I deal the zombies. They all went out as I shoot the buff zombie behind us. But no use, it didn't die. I even shot his head! The only thing that can kill the buff zombie was the building. The others were all falling to the big field, except for me. The train passed the big field and was about to crash with the building. I ran to the front of the train cart and shot the 3 running zombies with one ammo. I saw another train cart without a railway crash into the building. Without a thought, I jumped out of the train and into someone's apartment balcony. The train crashed to the building. Well glad that all train thing was over. I jumped to balcony to balcony just to get to the train cart. When I reached the train cart, I saw 12 people injured and there was blood everywhere. I ran out of the train cart to see what kind of apartment building this is. When I looked out, I noticed that there was some kind of building on the top left. Hey, that's a penthouse! I heard there was a doctor living there. So I jumped and climbed up there and I made it inside. I looked around for a first aid kit and found one. I look inside of it first and everything was still intact. So I went out of the penthouse terrace and I jumped and climbed down where the train cart was. When I finally arrived, I started to treat the people. And that's where the dream ended.