Electric traction signs
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On the French network, electric engines work with 1500 V DC or 25 kV AC.
On a long catenary distance the current loses power, thus there are electric relays on the lines.
With alternating current the different powers are not always in phase, so electric relays have a neutral zone.
1. 'Cut current' signs
Distant 'Sectioning' sign
This sign announces an electric sectioning
'Cut current beginning'
This sign indicates the beginning of electric sectioning.
It must be passed with the circuit-breaker switched off.
Temporary sign:
'Cut current end'
This sign indicates the end of electric sectioning.
Circuit-breaker can be switched on after passing this sign.
Temporary sign:
2. 'Lower pantograph' signs
Distant 'Lower panto' sign
This sign announces an electric sectioning with current type change. It can have a complementary sign indicating the next current type.
Temporary sign:
'Lower pantograph beginning'
This sign indicates the beginning of electric sectioning with current type change.
It must be passed with the circuit-breaker switched off and the pantograph lowered.
Temporary sign:
'Lower pantograph end'
This sign indicates the end of electric sectioning with current type change. The new current indication is usually added to this sign.
The engine driver must shift the current selector according to the indication then switch on the circuit-breaker and raise the pantograph.
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Temporary sign:
3. Stop signals for electric operations
End of catenary marker
This sign indicates end of electrified track.
Blue and white chequersign marker
This sign concerns only electric engines. It commands to stop.
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