We compare different model reduction methods applied to the dynamical system of a coupled transmission line: balanced truncation (BT), truncation by balancing one gramian (or PMTBR - poor man's truncated balanced reduction), positive real balanced truncation (PRBT) and its Hamiltonian implementation (PRBT-Ham), PRIMA, spectral zero method (SZM) and its Hamiltonian implementation (SZM-Ham), and finally, optimal ℌ2. Their performance is analyzed in terms of several criteria such as: preservation of controllability, observability, stability and passivity, relative ℌ2 and ℌ∞ norms, and the computational cost involved.