You are the section foreman on a 4 entry longwall development panel that has been driven about 4,000 feet from the mains. You are in the track entry checking supplies with the utility man when you get the strong smell of smoke. You check and find that the smoke is not originating on your section. You call the dispatcher to find out the source of the smoke but he does not know and tells you he will try to find out. You assemble your crew, don your SCSRs, and then board the man trip and begin riding out of the section in the alternate (secondary) escapeway. You want to travel as far as possible on the man trip since this is the fastest and easiest way out of the mine. You travel in the man trip about 3,000 feet until the smoke becomes so thick that you can't see to continue. You stop the man trip and lead your crew into the primary escapeway where the smoke is not as heavy and continue your escape on foot. You travel about 1,100 feet in the primary escapeway until you reach clear air in the mains and discover that you are outby the fire.