  The inclusive cross-section for tW production in proton-proton collisions at
$\sqrt{s} = 13$ TeV is measured with a dataset corresponding to an integrated
luminosity of 35.9 fb$^{-1}$ collected by the CMS experiment. The measurement
is performed in events with one electron and one muon, and exploits kinematic
differences between the signal and the dominating $t\bar{t}$ background through
the use of multivariate discriminants designed to separate the two processes.
The measured cross-section of $\sigma = 63.1 \pm 1.8~({\rm stat}) \pm 6.0~({\rm
syst}) \pm 2.1~({\rm lumi})$ pb is in agreement with standard model
expectations.
