Actually an automated storage system rather than lockers. Feed your luggage into the mouth of the beast and it squirrels it away underground somewhere. Then present your claim ticket to the machine, and several minutes worth of ominous noises later, the door opens and there it is. Allow time for the retrieval, the train will not wait for you (I speak from experience ). The price mentioned by soitgoes sounds about right, perhaps slightly less for <4 hours.