Model locomotive gearbox housing

FIG. 1 is a perspective view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 2 is an elevational front side view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 3 is an elevational left side view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 4 is a top view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 5 is a bottom view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 6 is an elevational back side view of the model locomotive gearbox housing, bearing the ornamental design of the invention;

FIG. 7 is an elevational right side view of the model locomotive gearbox housing, bearing the ornamental design of the invention; and,

FIG. 8 is a perspective, environmental view of the model locomotive gearbox housing, bearing the ornamental design of the invention, and showing the environmental components of the model locomotive in broken lines.

The broken lines showing environmental components associated with the model locomotive gearbox housing in the Figures are for illustrative purposes only and form no part of the claimed design.