I have now added rail wiper pickups, fabricated from 0.2mm phosphor-bronze sheet, as fitted to number 8 'Freshwater'. This has improved pickup no end. I still need to permanently fix the con-rods, add 'stay-alive' capacitors and couplings, as per 'Freshwater' before I can give it a proper test on the layout.
Here is a view of the wipers that I added to number 8 'Freshwater':
Edited to add photo of wipers.