WOW this is going to be a monster build but I will keep up to date on it, always loved Garratts, the SAR class GL was about the same size as the class 58 but I think the tractive effort at the draw bar was a little higher, the SAR loco was on a gauge of 3ft 6in whilst the class 58 is a metre gauge, the EAR as it was known before had the very big class 59 Garratts which had slightly more curved lines to the front and rear tank and bunker.
Good luck
Owen
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