Help with Ben

It could simply be a prior owner had added extra weights for some reason. I know in the past when fixing loco's I've won in job lots that some have had more weights than other loco's of the same type. I've never been sure if its a case of some have had them added or some have had them lost at some point. After all when you buy a job lot of 'faulty' loco's you never know how many times they've been apart