| 摘要 |
A model railroad crossing gate includes a base, a crossing gate mounted on the base for movement between a raised position and a lowered position, a spring coupled to the crossing gate biasing the gate to the raised position, a string attached to the crossing gate and the base for pulling the gate against the spring, and a tensioner engaging the string for pulling the gate from the raised position to the lowered position. A controller is coupled to the tensioner for controlling the position of the gate. The controller is preferably is also coupled to a limit sensor and a motor for operating the motor to move the gate from the raised position to the lowered position or vice versa and then stop the motor. The controller includes a first input responsive to an input pulse for producing a crossing gate activating signal having a duration longer than the duration of the input pulse for moving the crossing gate fully between its raised and lowered position, and a second input responsive to an input signal longer than a predetermined minimum for producing a crossing gate activating signal having a duration equal the duration of the input signal. The controller includes an output for controlling a second controller and an input for receiving signals from a remote controller.
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