Thanks to the building of Westway, Latimer Road is nowhere near it's namesake (although Fresner Road used to be Latimer Road)
My maternal grandparents lived in Latimer Road, which until it was decimated was a very busy rat run. Looking on Google Map, draw a line from its present 'stump' down to Queensdale Road, that was its extent, it then became Norland Gdns, which gave access to Holland park Avenue just where the M41 roundabout is. The area has been so developed, if you want some idea of what the neighbourhood was like, the final chase in the Blue Lamp, or episode of the Sweeny or Minder will give you a flavour
Chris m. you are correct that Chigwell Lane stn is/was just off what is now called Chigwell Lane (though hardly now a lane) though the station started off as "Chigwell Road", but that of course wasn't an official street name, just an indication that it led to Chigwell. This station gained a certain immortality as plain "Chigwell" in the Victorian ballad "The Chigwell (sic) stationmaster's wife"
I'm pretty sure the 'oldest' to which they were referring was for a locomotive powered railway providing a service for the public..
Such as the Stockton & Darlington?
However, the oldest tunnel on a public railway was probably at Tyler Hill on the C&W. It was built for locomotive haulage. Unfortunately, the 1/56 gradient proved to much for the locomotives available in 1830, and it ran with cable haulage (along with two other sections - not sure if the section with he famous bridge was one of them) for the first fifteen years of its existence.
Of course many of the earliest wagon ways were also underground, inside mines.