An interesting book covering Locomotives from the London and North Western Railway using the eight wheel configuration of locos
Locomotives Illustrated 20 Gresley Eight Coupled Locomotives
LOCOMOTIVES ILLUSTRATED 29 GWR EIGHT COUPLED
Midland Engines No. 2 Class 3 Belpaire Goods Engines Railway Book VGC
8 Coupled Goods Engine London & North Western Railway postcard
HEAVY GOODS ENGINES OF THE WAR DEPARTMENT - VOLUME 3: AUSTERITY 2-8-0 AND 2-10-0
L & N.W.R GOODS ENGINES 1846 - 1903