Switzerland has some for narrow (meter) gauge to standard gauge. I think it's to make the Glacier Express run without changing train. Had a bit of teething prob

Switzerland has some for narrow (meter) gauge to standard gauge. I think it's to make the Glacier Express run without changing train. Had a bit of teething problems at the start but seems to be working well now. That's not a "change gauge for a 100-wagon freight train" scale operation, and it's not "off the shelf" tech, but we're fairly close I think?