It would be very helpful to have a method like isStockOverhead(), so that we don't have to do a more expensive, less intuitive method call such as detector.info() ~= nil.

It feels to me like something that is rather simple to implement, and would provide a nice convenience to the people using the augments.

I'm going to recommend you use the ir_train_overhead event in CC/OC (CC will be available in the next release)