The historic steamship 'Earnslaw' has burned one tonne of coal an hour, but the new combustion fan system may cut coal consumption and curb emissions in the long term. Photos by James Beech. : Cruising with efficiency

TSS 'Earnslaw' chief engineer Ross Morton sits beside one of two new fans that draw preheated air from the tube room and direct it to the firebox. The new system is designed to make the vintage steamship burn coal more efficiently. : Cruising with efficiency