The H2O2 (hydrogen
peroxide) fill and drain valve.
Picture 1 of 2.
A hose from the hydrogen peroxide servicing truck would attach here to fill the
peroxide tank on the engine. Another hose would attach to the hydrogen peroxide overflow and vent port,
located on the end frame next to the steam vent, and connect to the truck's
H2O2 overflow tank (basically an enclosed
Overflow hydrogen peroxide was diluted and discarded, due to the possibility of
hydrogen peroxide required special handling procedures (personnel who handled
hydrogen peroxide wore protective clothing consisting of boots, flame-proof
coveralls, a face shield, and gloves) and any contamination would make the
peroxide dangerous to handle.