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n - - Must tl® agreements which are already in formal documentary sliapa for of traffie, such as those between southern Pacific and Santa Fe, between Southern Pacific and s*P.L»A«& 8®L*R*R*# between Union Pacific, 0*s.l® and s*P.i»*a .s- s»L® and between G.n*L« and stage Lins be filed? 4« where no formal written agreement exists for interchange of traffic hut traffie is interchanged under long standing and understood arrangements, must a formal arrangcEiexit be prepared and filed? 5i If not absoltffeely necessary to prepare formal dootment covering inter change, is it not advisable that it he done? In other words, in view of the provisions of the law, it is advisable that the formal consent be obtained from each carrier to act as agents for it in the issue of thro tickets and the collection of through rates covering its line, also the forwarding of through baggage? 6# If deemed advisable to obtain such formal authority, will it' not be advisable to request the Commission to provide a tmiform blank for carriers to use? ?? under the present requirements of affording equal facilities is a carrier operating through oars with certain lines obligated on demand to operate similar through cars with other lines competing with the connecting line? To illustrate,- through cars are operated between Pacific Coast and Chicago over certain lines east of the Missouri River® Is there any obligations on the lines west of the Missouri River to operate si jailer through cars with lines east of the Missouri River over which they are not now operated® ®§ Must arrangements for operation of through oar trains be filed? H |