Yeah, it’s strange, who knows what a real Boxcar is supposed to look like. It’s not a big deal to me as long as it produces and tastes good. If I remember right, the pic on my seed packet (I think it was Ferry Morse?) shows them to be round. Most of mine have never been bigger than a tennis ball.
I’ve noticed that my BW fruit tends to also fruit out on strigs, kind of like currants, although the fruit is much bigger, of course. There’s maybe 4-6 fruit on each strig.
@IowaJer started a thread about this-