I used to have a massive RR conductor uniform collection but got rid of it all.
These days, I mostly collect WW2 army RR items as well as anything from the 3-footer ET&WNC RR. I have many original photos from the 30s and 40s. Recently, I got two spikes pulled from the ROW at Elizabethton, TN. I wire brushed both of them and painted them and put the road name on each before their ID got lost...
Army RR conductor's badge from WW2:
And a few of the manuals and TMs from that era: