Spring RTS Engine

For anybody who doesn't know what i mean
http://imageshack.us/photo/my-images/842/loltrail.png/
Yes i had a thread having that thema but.
Now how do i simulate it correctly witout the usage of Spawners? And yes i did those once befor with Spawners and i am search for a Trail method WITOUT Spawners

for someone who doesn't know what i mean with Spawners
A spawner is a function part on CEG that spawns other CEG's

We told you the solution.