Abstract: A process for the production of a core that can be used for the manufacturing of a part that is made of composite material, whereby the core consists of at least one powdered and/or granular product (16), includes introducing the at least one powdered and/or granular product (16) by vibrating it in an outer envelope (14) placed in a device (18) having a cavity that is delimited by a wall (20) whose geometry is adapted to that of the core to be produced and flattening the outer envelope (14) against the wall (20), characterized in that vibrations are emitted slightly above the fill level during filling.

Abstract: An operator for a railroad implement is provided with a linkage which mechanically isolates an actuator from impact forces transmitted through the linkage. Isolation provided by the linkage permits the use of a low power actuators which easily lend themselves to complete energization from solar energy sources. The operator is also provided with a safety electric interlock to prevent energization of the actuator during manual operation. A spring assembly tool is incorporated into the operator housing to facilitate installations and removal of compression springs in the operator mechanism.