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A bit out of date, but this interactive map of step free London is very good
I visited Caledonian Road station in July 2019. It is now entirely accessible. I chatted to a member of staff at the entrance as to why the signage on the train showed this as being only partially step-free, and he explained that the train signage probably needed updating. He also gave me a more up to date tube map.
All the London railway stations :
Caledonian Road station
Caledonian Road station platform with a section of it raised for step free access to trains
Caledonian Road lift from platform level
Caledonian Road is on the Piccadilly line, and is accessible to wheelchair users as there are lifts between the street and the platforms. See pictures and further accessible transport in London detail from links below.
Underground lines : Piccadilly
Accessibility friendly : YES.