| 摘要 |
A train warning device has a ladder frame with barrier sign hingedly mounted for movement by an electric motor between positions folded against the frame between the tracks and upstanding transversely from the tracks. Releasable clamping arms are mounted at the top and bottom of ladder uprights for securement thereof to track ties and enabling passage of a train thereover when folded. A signal receiver/micro computer mounted on the ladder frame controls the motor operation in response to a signal received from a hand held remote controller. A battery mounted on the ladder frame supplies power to the electric motor, signal receiver and other devices such as lamps to ensure independent operation. The barrier sign is profiled as a flagman with a sprung warning arm carrying a stroboscopic lamp. The ladder frame can be used to access the track from an elevated platform.
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