Nice find. Baldwin made their gear to last, so did EMD. A lot of the desiels working on American and Canadian railways rolled out of the shops in the '60s, some even earlier. I read that a bunch of these EMDs are forecasted to still be in work for another 30 years. Many American carriers sold their old locos to other countries when they upgraded, and there are still some 1900 -'22 (about) Baldwins in revenue service in less developed places.
It's fascinating learning the mechanics that went into locomotives to meet specifications of the company, terrain, and workers.