Follow a leader with delay

Having a bunch of layers all distributed in z space. Now the first layer starts to move towards the camera.

After Effects CS3
Useful things
Expressions

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After a specific time you want to move the second layer to move with the first one, etc.

Name the first layer "leader" and apply this expression to all the other layers position property.

Here is the expression:

//applyTo: position
L = thisComp.layer("leader");
delay = 1.5;
timeToStart = 0;
myDelay = (index - L.index)*delay;
t = time - (timeToStart + myDelay);
if (t > 0){
  delta = L.transform.position.valueAtTime(t) - L.transform.position.valueAtTime(timeToStart);
  value + delta
}else{
  value
}

by Dan Ebberts

(Min. Version: After Effects CS3, Category: Useful things, Type: Expressions)