  Comprehensive rotation-vibration line lists are presented for the two main
isotopologues of methyl chloride, $^{12}$CH$_3{}^{35}$Cl and
$^{12}$CH$_3{}^{37}$Cl. The line lists, OYT-35 and OYT-37, are suitable for
temperatures up to $T=1200\,$K and consider transitions with rotational
excitation up to $J=85$ in the wavenumber range $0$--$6400\,$cm$^{-1}$
(wavelengths $\lambda> 1.56\,\mu$m). Over 166 billion transitions between 10.2
million energy levels have been calculated variationally for each line list
using a new empirically refined potential energy surface, determined by
refining to 739 experimentally derived energy levels up to $J=5$, and an
established {\it ab initio} dipole moment surface. The OYT line lists show
excellent agreement with newly measured high-temperature infrared absorption
cross-sections, reproducing both strong and weak intensity features across the
spectrum. The line lists are available from the ExoMol database and the CDS
database.
