Lead Lined Wheel Journal when ?

Question

I assisted Dad on the Removal of Journal that had overheated/

On these there was Waste(Rags) with 1/2 of Box with Oil,It was a Splash Lube system,The Lead (Babbit) would melt and

was in the Rags we removed,Made fish sinkers out of it.These would sometimes set Right of Way fires,in 1954,The ones now look like Roller Bearings,they don"t overheat and cause fires,What type are They?

Answer 1

When I work as a car knocker in 1975, they was made of brass.

Answer 2

it was called 'white metal'

Answer 3

Graphite? compressed carbon balls?