I have noticed that certain engines will be listed, for example, 726RR. Others do not have that designation. What does it mean?

 Thank you 

Original Post

726 RR is the Re-Run of 726 loco in 1952 caused by shortage of metal used in "Magnet-traction" Original 726 changed to 736 then back to 726RR then back to 736.  Same with 671 and 681

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