Water tubed boiler

Vertical firebox showing the 90 water tubes

Fully assembled April 2011 when it passed its first hydraulic test at 412.5psi

7109’s 275psi boiler is a vertical water tube type with superheater fired from below via a firebox door. Blast pipes, blower and chimneys sit above the boiler in the cab. Each engine has its own chimney, each with a pair of blast nozzles and blowers.