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… and snow is three inches or greater above the top of rail; the crew has experienced unusual braking conditions or … there is no fence or other barrier between them, moving rail cars not headed by an engine or when headed by a … use. (f) When advised by special instructions that rusty rail or other conditions may exist, occupancy of crossings …
21.305
… Railway Medical Rules for Positions Critical to Safe Railway … 1.Short Title 2. Scope 3. Definitions 4. Frequency of Medical Assessments 5. Assessment for Medical Fitness for Duty 6. Medical Restrictions 7. Records …
91.507
… 351. Application On portions of the railway so specified by special instructions, the use of the main track will be governed by the Special Control System. 352. Supervision Movements and track … who will issue instructions as may be required. 353. SCS Special Instructions Special instructions necessary to govern …
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