|The boxcar plays not important role in these books after the first one.|
I could also point out that none of them look like they have a freakin' clue as to what they're doing. I mean, look at the kid in the back (Benny). That is not how you hold a hockey stick. And the girl towards the back (Violet), looks like she's just walking on the ice, not skating, lackadaisically gesturing vaguely towards the puck.
But what caught my eye when rereading the post from yesterday is that they're very clearly in an indoor rink (given the boards behind them.)* But none of them are wearing gear-- not even helmets. I don't know any indoor rink in the US (and I'm guessing the same goes for Canada, although those rinks are clearly not going to operate under USAHockey rules). No one is allowed on the ice when there is hockey playing of any kind without at least a helmet! (And I don't think I've ever seen anyone in a rink without wearing gloves, too, even if they aren't in full gear.)
Someone across the ice is going to take a shot on the net behind those kids and a puck is going to hit Benny in the head and the next book will be The Concussion Mystery. Or a puck will hit Henry (the oldest guy) in the crotch and will wipe that smile right off of him. (The 'Can Henry Still Have Children?' Mystery, Boxcar Children #217).
*I will however congratulate this cover for putting the boards and the glass above said boards instead of how most of these romance novels seem to forget the glass and have their heroines resting their folded arms on the boards to watch their hockey heroes.