Finally, TF2 inside TF2

I often look at this color scheme because I don't think i see it often on American freight cars. Usually, they have designs and logos on them.
The name is "TF2 RED and BLU 40ft Boxcars".
I look at the photo again carefully. On the wall, this boxcar is "RED" and this one is "BLU". So I read the explanation again. A childhood memory. Yes, I get it. That kind of thing is important. But "BLU" should be "BLUE".
So I looked into it further. It's a proper noun.
I play like this. "BLU" "RED" I don't think I'll ever forget it. Thank you.