to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Detail view of the mail hook on CBQ 1926, a RPO preserved at the Illinois Railway Museum. Photo by Sean Lamb (User:Slambo), July 16, 2005. {{cc-by-sa-2.0}}