Alright, I don't know where JB is,so I'll debunk it myself..
Firstly we will go through the Pro's of this conspiracy, and then the cons
This wouldn't be the first time this happened, there was a certain switchero of two GNR locos to prevent
( or delay) the scrapping of the local favorite loco.
Meadbh was withdrawn before Macha, so they could have been scrapping her when the preservation team said, we want to save her, CIE were like "whoops. Ah we will just give em Macha with Maebhs name/number plates.
Cons
The main one.
Meadbh was sitting in Thurles, in 1961-2 having been repainted, while Macha was still doing Any work she could find.
The timeline doesn't really matchup.
And I can't see CIE bother their arse doing some sorta elaborate scheme like that.
Next time, I debunk the illuminati conspiracy theory
Spoiler alert
Reason one: it's utter crap some Internet troll invented in his Moms basement..