The GSR had it tough, a triple whammy of WW1 and Civil War legacies and then worldwide depression from '29.
They weren't slow to experiment...Sentinel shunters and railcars/Drumm battery train/various gimcracks for increasing steam efficiency, etc. I'm sorry for all the fanboys out there, but the 800s were rather unnecessary white (or is that green?) elephants.
Pity they had to strip almost all pre-GSR locos of their sometimes evocative names, doubtless they found their way into the melting pot to make brass bearings or something. Think one of the biggest losses to preservation was the Tramore 2-2-2, word on the street had it that it might be an early candidate for preservation had it not come a cropper.
NBL also tendered CIE with a centre cab loco, but they chose GM instead, have a drawing of it that might-have-been somewhere.