We wound up removing legacy locomotive from esir in favor of new internal art in 1.3.36.
It was removed from dependencies but not made conflicting, so it isn't obvious it should be disabled—however noticed mention of its recipes in your changelog so wanted to give you a heads up in case it isn't intentional.

Thanks for the heads-up. I missed the fact that legacy locomotive was dropped from esir's dependencies.

Fortunately, the mod still functions fine without it under normal gameplay, so it shouldn't cause any real issues for now. I'll make sure to clean this up and push a fix along with the next update.