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Description
Unit #4 is the 4th train made and sold by the toughrail company during the 2030s , and had some success as a freight locomotive. Its ability to run without fuel for months on end made it great at international freight routes, however, it uses a very expensive fuel that needs to be handled by special trucks. There was also a posibility that the engine could explode if not treated with care.

Bonus: can you figure out what fuels all of the units?
Hint:its a real sorce of energy that has been used to power submarines!

Description
Unit #4 is the 4th train made and sold by the toughrail company during the 2030s , and had some success as a freight locomotive. Its ability to run without fuel for months on end made it great at international freight routes, however, it uses a very expensive fuel that needs to be handled by special trucks. There was also a posibility that the engine could explode if not treated with care.

Bonus: can you figure out what fuels all of the units?
Hint:its a real sorce of energy that has been used to power submarines!