convert babbitt to insert bearings

[trainguy]

Poured bearings will not take the abuse that inserts do.If you drive the car with respect to the old technogy of the poured bearings and make sure the dont develope excessive clearance and pound them selves into failure.The thickness of the babbit allows for adjustment by removing shims and scraping,the thickness and softness of the babbit causes them to pound out if the clearence become excessive.