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The stock Atlas RS-1's pilot does not look very prototypical. Look at http://www.railpictures.net/ and searching on Alco RS-1 you will find almost 200 pictures but none without the casting that appears above and around the coupler.

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Instead, their couple pocket sticks out of a flat pilot way too far and looks like nothing Alco ever did.

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There are two screws that hold the pilot on the deck. Remove those and the handrails from the pilot. Pull, cut or blast off the Atlas coupler cover as it will not be used. Remove the Atlas coupler and spring. That will allow you to see small screw that ho

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I used a casting from Ed Reutling to rebuild. A stock Kadee 805 is installed in the hole. You will have to drill and tap a new hole for the Kadee. As to where that hole is, I placed the casting on the pilot and allowed the coupler box to just clear the ca

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Next is a .040" piece of filler which covers the hole. Now, looking again at http://www.railpictures.net/, many roads left this big hole open. Some ran a filler along the bottom and not the sides. Many variations on this so you can do most anything o

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The Kadee needed .080" of a shim but double check yours with a gauge. The shim will be totally hidden by the casting so it does not have to be pretty.

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Add an air hose and you’re finished. This one shows the V section of the old pilot added back in.

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This one the V was left off. Engines had modifications done to them at different times so making some variations is fine.