There is plenty of information from TfL on step-free access to tube stations but is there an equivalent guide on stations that may involve steps to access them but where escalators can be avoided? My wife is a guide dog owner. She is perfectly able to use stairs but the dog cannot use an escalator. To know which stations have the option of steps, even they also have escalators, would open up options to a bigger range of stations than can be identified than though the step-free guide. Is such a guide avsilable?