Wolf Queen is one of the three Jaegers featured in Pacific Rim: Training Day.
After Crabcat's location is revealed by Redflag Horowitz's Wave Laser, Wolf Queen shoots the Kaiju repeatedly with its Railgun, wounding it and revealing its heart. Unfortunately, with no ammunition remaining, it falls to Shameless Fox to finish the battle.
Wolf Queen possesses a Railgun on its right arm that is capable of grievously wounding Kaiju. However, its ammunition is limited.