The boggies dont look to old to me. If anything they look like they have just been replaced. I recon you dont go there again, but you prob will so keep an eye out.
They're Timken Roller Bearings. They've been making them in that bright yellow finish for over 60 years. They look ancient to me, and I build and service MKII SAR Bogies in my sleep.

Love the railart pictures anyway. I hadn't seen this topic when it was posted hence dragging to the top. Well done and happy learning with the camera!
(Get me more railart pics.)