Geared steam locomotive
This gearing is part of the machinery within the locomotive and should not be confused with the pinion that propels a rack locomotive along the rack between the rails. The geared steam locomotives that have been built have been for conventional track, relying on the adhesion between wheels and rail.
Branford Steam Railroad
Just as steam locomotives gave way to diesels on the line in the 1950s 
so too did the rolling stock change as the side-dump gondola cars gave way to 
triple-bay hopper cars lettered for the New Haven 
Trap Rock Company. Whereas the steam locomotives had been lettered for the 
same company ("e.g." steam locomotive No. 43 carried the words 
"N.H. Trap Rock Co." on her saddle tank), some of the new diesels 
ironically carried the lettering of "The Branford Steam Railroad" 
despite the fact that it no longer was a steam railroad.