Weichenantriebe

Weichenantriebe are devices used in railway turnout systems to move the movable point blades between the positions required for routing trains. They convert energy from electrical, pneumatic, or hydraulic sources into motion that shifts the points and locks them in place. As components of the turnout, they are coordinated with signaling and interlocking to ensure safe routing.

Drive technologies include electric actuators (such as motors with screw drives or rack-and-pinion gear), pneumatic cylinders, and hydraulic cylinders. Some installations provide manual backups. Many Weichenantriebe are designed to be fail-safe: in the event of power loss, a return mechanism or locking arrangement moves or holds the points in a predefined safe position, and a position feedback signal is sent to the interlocking.

Position sensing and safety: The actual position of the points is monitored by limit switches, sensors, or encoders. This information is used by signaling and interlocking systems to verify route status before signals are cleared. Safety-critical installations incorporate redundant components and regular testing to meet RAMS requirements and railway standards.

Control and integration: Weichenantriebe can be operated locally at a turnout cabinet or integrated into central interlocking systems and remote control networks. Modern networks may connect to train protection systems and onboard signaling (including ETCS), ensuring coordinated and secure operation across routes.

Environment and maintenance: Devices are built to withstand outdoor weather, vibration, and track debris. Regular maintenance includes inspection, lubrication, wear checks, and functional testing of actuation and locking mechanisms to preserve reliability and safety of the turnout.