Warm the sauerkraut and turkey separately in a microwave-safe bowls for 30-seconds; set aside. Spread butter generously on one side of each slice of rye bread then spread the thousand island dressing on the other side. Divide the sauerkraut, turkey and Swiss cheese on two slice of bread with the butter-side down. Stack the remaining two slices of bread with the butter-side up on top.
Heat a large griddle pan over medium-low heat. Arrange the sandwiches on the griddle and cook until lightly browned and the cheese is melted, about 3 minutes on each side.
To save time, you can also cook this sammy in a toasted sandwich maker if you like.