I'm pretty sure the model of train is a proper name and it's named after the satellite. I don't think I would describe any train as a literal "sputnik" of the rails.
Also Russian is full of composite words like that. "Explorer" in russian would be "исследователь" (issledovatel') - ис (completely) + след (trace/footstep) + оват (make, imbue) + ель (he who). Literally it would be "he who makes (places) completely (covered in) footsteps"
I would argue it's not. There's still a lot of professional and industrial software that doesn't run on Linux at all, even through Wine. I've had a glimpse into the world of industrial automation, there's a bunch of devices that simply don't have the drivers to run on anything but a specific (old) version of Windows. Supply chain issues would persist for decades.