In the context of trains, "RC" can have multiple meanings:
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Reservation against Cancellation (RAC): In Indian Railways, the legend "RC" appearing on tickets and reservation charts indicates RAC status. This means that passengers with RAC tickets are provided reserved sitting accommodation.
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Spot on reserve but might get cancelled: In a discussion on India Rail Info, a user mentions that "RC" means the spot is on reserve but might get cancelled. This is in reference to a specific train status, and the exact meaning may vary in different contexts.
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Rc class locomotive: The Rc class is the most used electric locomotive in Sweden, and it is a universal locomotive used in both freight and passenger trains. The largest operator of Rc locomotives is Green Cargo, but SJ, Tågab, Hector Rail, and the Swedish Transport Administration also operate them. Previous operators include Veolia Transport. The Rc locomotive was first introduced in 1967 to replace older D-locomotives and is known for using thyristors instead of the older relay-based system.
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Reserve Capacity (RC): In the context of rail freight corridors, Reserve Capacity (RC) is an offer for international ad-hoc traffic along the corridor. It is provided as a contingent of "capacity slots" for international freight transportation.