On this particular shot, the first three rails are running with the angle of the shot (CB hits the rail and goes to the right), but the 4th reverses (hits the rail and goes left). So the running english the CB picks up on the first three rails turns into reverse english on the 4th rail and slows down the CB. So you've got a fairly wide range of speeds that kill the CB behind the 7. That's one of several reasons the 3-railer seems better to me.
Cory
Cory,
You articulated and extended my thoughts about the three railer and speed, Perfectly.
JoeyA