Modification-By: Guus Schreiber:
;; BUG: renaming not done for parameter slot WEIGHT
;;
;; In the last version all paramter slots were consistently renamed
;; Probaly by accident, "weight" was not renamed in 5 cases.
;; The weight paramter slot should probably be replaced by the following
;; five parameter slots:
;; car_guiderail_weight,
;; car_phone_weight
;; car_intercom_weight
;; car_position_indicator_weight
;; car_lantern_weight
;;
;; The constraint car_fixture_weight_c will need to be changed accordingly