In my opinion i partly agree with you.I believe the 800s were useful engines but deprived of their chance to truly be recondnised as this.The Woolwiches were brilliant locos and were well known for their reliability.As for the 400s i think when the 500s were designed 5-6 of the 400s should have been scrapped to make more 500s because when they were 4 cylinder machines they were notoriosly unrealiable.Yes, their rebuilding hugely improved them,but cost the GSR alot.The steel sided coaches were actually a step forward in irish coach building but the GSR did not have to make such a big deal about them.The purple/maroon livery of the BRs mk1s.