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Didn't know that a fluid coupling and a torque converter could be used together. The experience I have is not on the railway, it's either been a fluid coupling or torque converter connected to the prime mover depending on the application.
There isn't a clutch, probably a fluid coupling or torque converter. you can get loads of info/pix on this if you do a google search.
Hope this helps 8-)
You can also try testdisk: https://testdisk.en.softonic.com/
The only time I have not been able to recover lost files with this program is when the disk read/write head has been damaged. This shouldn't apply to you as you've got an sd card.
If this doesn't work I don't know what else to try!
Do a search for photorec, it's free software and runs on a pc. I have used this many times on Linux OS to retrieve deleted photos/files, even if the disk has been reformated. You should be able to get all your photos back.