| 摘要 |
A current collector (4) is applied against the catenary line (10) by controlling at least one pneumatic actuator (8) acting on an extendable (deployable) structure (5, 6, 7) supporting the current collector (4). When the current collector (4) is in contact with the catenary line (10), a controlled (slaved) pressure is applied to the pneumatic actuator (8), which pressure is a function of at least one operational parameter of the unit, such as the speed of the unit, the current necessary for supplying the electrical installations of the unit or the type of the catenary line (10). <IMAGE>
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