Editing Locomotive frame (section)

{{One source|date=May 2024}}
{{Short description|Chassis for a self-propelled railway vehicle}}
[[File:Frames in position, Pacific construction at Doncaster works (CJ Allen, Steel Highway, 1928).jpg|thumb|Locomotive frame of a [[LNER Gresley Classes A1 and A3|LNER Gresley Pacific locomotive]] during construction]]
A '''locomotive frame''' is the structure that forms the backbone of the [[railway]] [[locomotive]], giving it strength and supporting the superstructure elements such as a [[Cab (locomotive)|cab]], [[locomotive boiler|boiler]] or bodywork.  The vast majority of locomotives have had a frame structure of some kind. The frame may in turn be supported by axles directly attached to it, or it may be mounted on [[bogies]] (known as trucks in [[American English]]), or a combination of the two.  The bogies in turn will have frames of their own.