In a previous job, I had the opportunity to visit the factories of Caterpillar, big yellow machines, and I questioned the wooden floors. Apparently all their factories are floored with wooden setts, which from memory were about 3" or 4" square, end grain upwards. I'm not sure which species are used, nor how they are fitted (likely bedded in tar/bitumen), but it seems that the advantages outweigh the costs. I understand they last well, and are quiet. Possibly less fatiguing than a concrete floor too.
On level crossings, particularly pre War, I expect that a fair amount of traffic was horse or horse-drawn. I could imagine that great iron-clad hooves might have some impact on timber, but given the need to lift the road surface regularly, to maintain the PW, I guess there's little alternative as iron or steel plates would be unacceptably slippery for horseshoes, possibly treacherous even for iron or rubber tyres, and horribly noisy too.
Best
Simon