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A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Chiswick is on the South West rail network, and has level access between platform 1 and street level.
Short ramp at approx 1:7 gradient to Platform 2 (for trains towards Hounslow) via separate entrance.
See pictures and further
accessible transport in London detail from links below.
Underground lines : National Rail South West
AccessAble Access Guide :
Accessibility friendly : Yes.
General description : There is level access to both platforms at Chiswick. There is no level interchange between platforms. - See wiki
More comment : National Rail Map & Guide