stilton:
There is a 'Loc' button on the 757 / 767 but it is not Vor/ Loc.
...
When tracking of a Radial is required you simply build the radial on the legs page and fly it in LNAV.
If you are instructed to fly a radial
outbound, is that possible to build that in the 757/767 FMC?
Not possible in the 737 (unless you put in an arbitrary distance, which will lead to route discontinuity and "using reserve fuel" FMC warnings and so on), we do have VOR tracking capability though.