  These proceedings highlight a selection of recent ATLAS and CMS measurements
which target either the production of a single top quark or the associated
production of a top-antitop quark pair together with a $W$ boson, a $Z$ boson,
or a photon ($\gamma$). The highlighted analyses are based predominantly on
proton-proton collision data collected by the two experiments during Run 2 of
the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV with datasets
corresponding to integrated luminosities of up to 77.5 fb$^{-1}$. One
combination of ATLAS and CMS single top quark measurements employing the full
Run 1 dataset based on $\sqrt{s}=7,8$ TeV is also included. Such measurements
probe the Standard Model couplings of top quarks to gauge bosons and offer
sensitivity to a number of anomalous non-Standard-Model effects.
