Take two 9 x 5 inch loaf pans, grease and flower them, and preheat your oven to 350 degrees F.
Take the flour, baking soda, and salt, and sift into a large bowl.
In a different bowl, take the margarine (or butter) and sugar and mix until smooth.
Then take the eggs, bananas, and walnuts and mix those in until it is well blended.
Take wet ingredients into the dry mixtures and stir until blended even more.
Divide batter evenly between the two pans you had readied earlier.
Bake for 60 - 70 minutes. Or until a knife can be inserted and be able to come out clean in.
Let these loaves cool in the pans for 5 minutes at the least before moving them to a cooling rack to cool completely. Wrap them in aluminum foil to keep the moisture inside, and refrigerate for 2 hours if you feel the need to.