Can't remove unidentified barriers. Suggest that people with disabilities be recruited in this effort. Several methodologies have been used in this effort. One may be "Maps for Easy Paths (MEP): A Mobile Application for City Accessibility". Volunteers (or paid staff) can be recruited from local Centers for Independent Living. Payment is advisable both since training is required and payment is incentive to provide standardized quality information. https://link.springer.com/chapter/10.1007/978-3-319-93491-4_6
Wheelmap is another methodology, focused on wheelchair and scooter-users. https://opengeospatialdata.springeropen.com/articles/10.1186/s40965-017-0040-5
Station accessibility goes beyond ramps and tactile cues. Those with low vision, hearing loss, intellectual and developmental disabilities and debilitating mental health conditions also should be recruited to provide input, as their needs differ.