I found this forum because Tom852000123 mentioned it on one of his videos.
I've started zombies only about 2 1/2 to 3 years ago. Starting with WAW maps, they were already old by the time I started. I was mostly a camper, at the best I got to level 30 on Der Riese with two friends.
In the last 4-5 months I've started to learn to run zombie trains.
My bests are Assention 28- 4 man, 25 solo. Five 29 -2 man. NML 148 kills.
I'm sure that with a bit more practice and good tips I'll start to make some big runs in the near future.
I use a X-box 360