A tire shop should have lead weights with 2 sided tape on them , they are used for balancing custom aluminum wheels, or you could epoxy or tape lead fishing weights inside. Cool set of alcos![Y]
Get 'em while you can–lead weights are being phased out, in favor of zinc. The annual consumption is 20,000 tons!
I like the idea of using real castoff railroad spikes instead as toy-train weights. There’s plenty of room for them in boxcars, loaded or covered hoppers, and baggage cars. You can cut the heads off to pack them more tightly; but one, or part of one, is usually plenty.
I work in the wheel industry. Lead balance weights were phased out several years ago, replaced by steel clip on weights and zinc tape on weights. Most states have also outlawed lead shotgun shot as well.
Are the wheels slipping? On most of the magnetraction Alco’s I’ve handled, the wheels don’t slip. If your wheels are not slipping, I don’t see what adding weight is going to do. Just curious, what sort of cars were you pulling, postwar, modern, or a mix?