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It all lies in the General Code of Operating Rules. Bear with me, I'm gonna dig up what I can get, straight from the horse's mouth... My copy of Union Pacific System Timetable No. 2, Effective 0001 Sunday October 29,1995, shows ABS-TWC from CP N030 to N080, MP 29.7 - MP 80.1, and from N097 to N012, MP 97.8 - 101.5. Straight TWC is used from there to the end of UP's portion of the subdivision, MP 159.3. GCOR, Third Edition, Effective - April 10, 1994, says that TWC is "A method to authorize train movements or protect men or machines on a main track within specified limits in a territory designated by the timetable. A Track Bulletin is "A notice of conditions affecting train movement. It may also authorize movement against the current of traffic where Rule 9.14 (Movement with the Current of Traffic) is in effect." According to this timetable, there is no current of traffic on any portions of the Milwaukee Sub, so Rule 9.14 is irrelevant to the situation. Track bulletins are issued per subdivision, and there are two forms: Form A, which authorizes the display of yellow flags, to warn of temporary slow speed; and Form B, which authorizes the display of yellow-red flags to protect men and equipment. Track Permits, I'd have to dig for. Maybe they're required for workmen and equipment to occupy main the track where ABS is in effect without TWC?
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