This steel rocker jig was designed and made by Dr. Redden to aid in rockering all types of shoes on your anvil.
 
View a video of Dr. Redden Rockering a Rail Shoe.

Also we have included a  Rocker Slideshow with tips below.
Put your shoe in the forge.
Start rockering at the heel.
Work the hammer towards the toe.
The heels automatically curl inward with the rocker.
Soften the heel.  Concentrate on the inside branch.
Make a smooth transition along the foot surface.
The toe naturally bows due to rocker.  Forge it out.
This forging move prevents sole pressure.
Check the balance of the shoe from heel to toe.  This is very important.
Set the shoe squarely on the anvil and very gently balance the shoe on four contact points.
Use a dead blow technique to balance the 4 points.
Polish the heel smooth.  Remove all hammer marks.
Shoe spreaders work greate to open the shoe.
Take a post x-ray to determine if your mechanics and placement are correct.