by ExCon90
I would think that in a busy tower, when a number of levers have to be thrown in rapid succession because there's always another move to line up for, and some levers are mechanical and others not, it might be useful for the leverman to have a reminder "don't put your back into this one, or you could end up on the floor." I think FORD interlocking in Philadelphia was mechanical right up until it was remoted, and I think even BRILL was mechanical for a long time, when every northbound passenger train had to cross over, as well as a lot of southbound expresses. That must have made for an exhausting day.