Fujitsu PRIMERGY CX400 M4 Operating Manual page 50

Starting up
Figure 13: Turning outer rail
Ê Turn the rails to the other side (see arrow).
Figure 14: Removing inner rail from outer rail
Ê Push the locking latch (1) and pull the outer rail as far as possible towards
the front side (2).
Now the inner rail is removed from the outer rail.
50 Operating Manual
CX400 M4