The non-trivial electronic transport in magnetic topological materials have attracted significant attention. Here, we present evidences of a topological nodal line semimetal in antiperovskite \(\hbox {Mn}_{{3}}\) GaC along with the experimental studies such as the anomalous Hall effect (AHE), Kondo effect and thermal transport properties (Seebeck and Nernst effects). The upturn in the low-temperature electrical resistivity follows Hamann expression with the Kondo temperature \(T_{K}\) = 16 K. The scaling analysis of the anomalous Hall conductivity ( \(\sigma _{AHE}\) ) suggests that the AHE in \(\hbox {Mn}_{{3}}\) GaC is primarily governed by coexistence of both intrinsic Berry curvature and skew scattering mechanisms. The experimentally observed value of \(\sigma _{AHE}\) ( \(\sim\) 50 \(\Omega ^{-1} \text {cm}^{-1}\) ) is close to the theoretically calculated value. The low temperature Seebeck data suggests the presence of significant contribution of electron–magnon scattering, and a large value of Nernst coefficient is consistent with finite Berry curvature effects in \(\hbox {Mn}_{{3}}\) GaC. The electronic band structure calculations with spin-orbit coupling, shows the formation of a drumhead-shaped surface states, and the existence of finite number of Weyl nodes, in consistence with the experimental findings.
