"Robin Cox" writes:

There is a level crossing just north of Acton Central on the NLL
which is in zone 2 although I am not sure if it is any closer than Barnes.

There's another two just south of South Acton, one on the NLL, one on
the freight curve that connects the NLL to the Hounslow loop line.
For road users both these crossings are on Bollo Lane.

However, Barnes is closer to CX than Acton.

It's certainly closer than South Acton, but I think it's further than
Acton Central, which is due west of Charing Cross. If you're used to
the straight Thames of the tube map, you might have expected the
opposite (which is what I thought the "trick" was, but apparently not).