First and second crossing predictors communicate with each other, and each predictor transmits signals to instruct downstream adjacent predictors to activate their warning devices at a constant warning time by using train detection information from the other predictor. The system is menu-driven, and can accept information and requests from customers. Cell programming can be performed through hot-electron injection, with the electric field across the control capacitor to aid injection into the floating gate. The first end and the second end may have a stepped configuration. The support of the punch comers is improved by arranging the supports between the base body and the associated punch carriers such that in the final press position punches seated on the punch carriers are centrally supported in the line of the pressing force via the supports.