The evolution of the Grain Elevator is as fascinating as that of any other significant building type in Material Culture, as testified with the below "thumbnail" sampling of example images used in this webvolume.
The Typology Index (farther below), as well as the linked Chronolgy, help to illustrate that. (Each thumbnail image will also take you to its resident webpage and webchapter.)
What is a grain elevator? The simplest definition is "combined storage bins and grain-moving devices" (Banham 1987). Another is
a facility which stores dry, small cereal grains (as contrasted, for example, with a crib which stores corn still on the ear, or a silo, which stores moist, fermenting pieces of an entire plant), which handles grain in bulk, rather than in bags of other containers, and which stores, moves and processes grain vertically. (American Institute of Architects Journal, November 1977; emphasis original).
The basic arrangement of a grain elevator fits into two main Type-Families based on whether it is a discrete building ("Self-Contained"), or a semi-dispersed cluster of structures (Annex).
Within those classifications, there are several distinctive types based on grain bin design and arrangement, and also evolutionary level. Construction materials and design then determine different subtypes or material variants.
This typology is expanded as an indexed list below. (Names in [brackets] are tentative names, awaiting further research into contemporary labels or more appropriate descriptions.)
The following links will take you to the location for each entry in the typologies webpages. The smallest items will take you to separate Diagnostics and Examples webpages.