I am currently building a 5 inch gauge Bagnall 'Brick' in 1/5th scale.
It is calculated to require 2.6oz of water per minute to be running at a sedate 5 mph which is our club's normal passenger running speed.
Are there any live steam injectors available that has a small feed volume? So that it could be left on continuously to keep the boiler water level constant with another injector to top it up.