I received MTH passenger cars for Christmas this year, and am very pleased with how they've been so far. Only issue I've had is a malfunctioning coupler. The coupler can often stay closed under normal operation (although it has opened a few times on curves), but will come open if put under sudden or above average (but still reasonable) pressure.
Any suggestions on what to do? I've looked to replace it with a dummy, but it is attached to the entire truck mechanism. Will I have to replace the entire truck?