That locomotive is Proto Sound, the QSI proto 1 version. It is not ps2 unless someone upgraded it, and even then it would have a BCR-2 or 3v battery.
Do a reset, feature 18, and listen for the 2 toots (that means the reset took). If that does not work, let it sit on the track for about 1/2 hr at 12 VAC and see what happens. Sometimes the boards need a jolt to come alive.