Playing single player, this is by far the hardest chapter to date, notably due to the restricted finale.
The usual zombies are OK to deal with, as are the suicide ones, but the killer is the MG42 guy at the end. This section took me about an hour to do.
What I did was set a mine at the top of the first stairs, then mount the machine gun and kill the guy in the train compartment and the sneaky guy to his left. Exit and then run to the far side. Don't mount the machine gun but shoot the fuel in front and by the wall to the right. This should clear most of the zombies out. Wait for a second and kill the suicide guy, then lay a mine at the top of the right steps and run back to the other side MG42. Mount this and shoot the fuel in front immediately, then go to town on the zombies. The MG42 guy should come shortly so if possible focus on him until you start to get overwhelmed. Make good use of LB to kick zombies away and grenades, and pick up the Panzerfaust and 2 shots next to the ammo box. If MG 42 dude is still alive retreat to the other side and shoot Panzerfausts at his feet, hiding round the steps to avoid his gun.
This strategy worked for me, but it did take 7-8 times to perfect, so keep at it.
Also with the suicide guys, don't always panic when you hear them - sometimes you can stand still, let them get to you and as soon as they start run away and you will be ok.