The image is a close-up of the engine compartment of a steam locomotive. The engine is black and appears to be made of metal. There are several components visible in the image, including the oil pump, air pump oil supply, and water drain. 

There are also several pipes and valves attached to the engine. The oil pump is labeled with the words "Fill with Steam Cylinder Oil" and "Air Inlet for Blower". The air pump is located on the left side of the image and is used to fill with steam cylinder oil. The water drain is located in the center of the steam pump.

On the right side, there is a dry steam to whistle, 1/4 turn open, and a steam supply to oil tank. The left piston injector is located at the bottom of the tank. There is also a "Losen nut, pull apart to clean with #78 drill" and an ejector on the bottom right corner. The image is labeled as "D&RGW" and is likely a description of the components and their purpose.