the info_target does not work for cameras for me, when I try to use the info_target, the camera always floats off its path.
For the Camera, asign it to all the path_corner's it will be moving on, and its target should be the FUNC_TRAIN's name. The func_train should be assigned to follow it's path_corners, not the cams path.
The func_train should consist of an origin textured brush inside of another AAATrigger textured brush.
So what you'll need is two sets of path corners, a the camera, and a func_train.
GoodLuck