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    S-241. On subdivisions specified by special instructions, Clearance Form A will authorize a designated train to occupy one or more subdivisions without protecting against other trains. More than one train will not be authorized by Clearance Form A to occupy the same subdivision at the same time. When more than one train is to be authorized, train orders will be used and Rule 91 will apply, except the occupied subdivisions may be entered in emergency under flag protection on authority of Train Dispatcher.

    Clearance Form A authority to occupy a subdivision remains in effect until the Conductor reports the train clear of the subdivision or the Clearance Form A authority is annulled.

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