The war over Thomas!

Booga has been obsessed with everything Thomas the Train for about a year now.  He has a little bucket that he carries all his trains around the house in.  He has become more and more interested in PopPops as he's grown and begun to move around instead of just being that thing that cries and takes all Mommy's attention.  I've caught Booga giving him stuffed animals or toys, but the second that PopPops comes near his trains, he screams, throws them all into his bucket and runs away with them.  Poor PopPops just wants to play with his big brother :(  Grammie bought PopPops his own set of little toys including a tractor, train and police car, but of course PopPops wants to play with his cool big brother's toys instead.  The times that Booga has been able to play with children his age, he was more interested in playing next to, but not with, other children.  I've read that this is normal child development, but I'd like to get to the "with" stage soon, so that this Thomas war can come to cease-fire already.