To safely and smoothly change over a connection state of an actual operation before renewal to a connection state of testing after renewal in a short time and inexpensively in the case of renewal of the railroad signal protective device.
When replacing a first rack 10 with a third rack 30 among the first rack 10 and a second rack 20 connected with an inter-rack cable 60, a fifth rack 50 addition to a forth rack 40 is temporarily installed, the change-over switch 90 annexed to that is manually operated and the change over between the first connection state and the second connection state is performed. The change-over switch 90 is provided with a connection part 93 for attaching/detaching, a switch part 92 changing over the connection state by dividing the pins into four groups, and an operation part 91 for manual operation.
HARADA YUICHI
NEMOTO KAZUNORI
TAKAMIYA SHINKO
USUI JUICHI
DAIDO SIGNAL CO LTD
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