207. Fireman on Diesel road freight and passenger locomotives will remain in the cab of the locomotive with the engineer while the train is in motion except when necessary to enter the engine room to make certain equipment is performing normally. Only such time will be spent in the engine room as is required for this purpose, after which he will immediately return to the cab. At any time when fireman is in the engine room he will return to the cab immediately when signalled to do so by the engineer.
While in the engine room it is the duty of the fireman to observe signals at all train order and interlocking stations.
When a Diesel engine has a cut-out cock marked "Fireman's Emergency Brake Valve" on the fireman's side, the fireman must operate this valve when:
| ( a ) | The engineer fails to comply with a restrictive signal indication; or |
| ( b ) | In an emergency where the engineer fails to properly control the speed of the train. |
891. They will observe rules for other employes so far as they relate to the proper discharge of their duties.