What is the expected battery life for using the train sets? My son got the Cargo Train set 60052 for christmas, and we are chewing through batteries in the train in about 20 minutes. The first 10 minutes, it works excellent. After that, the train startsto get sluggish starting moving, then starts to need a little push to get going. After about 20 minutes, the train won't move, even with a little push. The LED on the battery pack is still on, even when the train won't move.
I've tried 3 different sets of batteries from different packs and brands, and its all the same issue.
The controller works fine, and as soon as we change the batteries in the train, it goes great again for a very short time.
Thanks.