A couple of pals, and myself, worked in a British Rail foundry - the one that used to be in Horwich - and we would take that stuff to get us through the night shift. The foreman would give us a shovel, put us in a raiway truck full of sand, and next to a conveyor, and say 'empty that by six o'clock'. Ephedrine works like speed but without the whoosh. Rocks aren't moved that way - and neither was sand.