All the London railway stations :
Farringdon station is on the South Eastern and First Capital Connect rail networks, and also improved as part of the Thameslink programme. Farringdon will be a modern, spacious station with a new National Rail ticket hall for Thameslink route and coming soon, the new Crossrail service. There will be two new entrances, a new concourse and platform footbridge, improved Tube access and longer, covered platforms that will be able to take 12-carriage Thameslink route trains. It will be fully accessible for people with buggies, heavy luggage or disabilities.
Farringdon station, entrance to Metro and Circle lines - in February 2019
It is important to understand that there are two separate stations which are opposite of each other at ground level. I need to confirm that the only access between the two stations is at ground level, i.e. are they two completely separate stations?
Farringdon station, entrance to Overground services (and Crossrail) - in February 2019
Underground lines : Hammersmith & City, Metropolitan, National Rail South Eastern, National Rail First Capital Connect
AccessAble Access Guide :
Accessibility friendly : Partial, but large gap/step onto most trains.
General description : Metropolitan line eastbound towards Liverpool Street, C step 0mm, gap 188mm. Circle line eastbound towards Monument and Hammersmith & City lines eastbound towards Liverpool Street A, step 150mm, gap 77mm. Metropolitan line westbound towards Harrow on the Hill B, step 1mm, gap 180mm, Circle and Hammersmith & City lines westbound towards Edgware Road A, step 163mm, gap 60mm. The newer Metropolitan trains avoid the large gaps and are accessible to wheelchair use.
Lift access between street and platform. See wiki
More comment :
Inclusive Britain Station Guide (this information may be out of date).