Smart-aleck dept.: They make the ones marked "UTLX." I used to work for a UT subcontractor many years ago. General American (GATX) and American Car & Foundry (ACFX), two other railcar manufacturers, were nearby. We made parts for them too. After all these years, I still look for their marks when I get stopped by a train.
We run about 2000 of these. 1/3 are UTLX.