Section 112. Routing of shipments by shipper of goods

In all cases where at
  the  time  of  the  delivery  of  property  to  a  common  carrier,  for
  transportation subject to the provisions of this chapter, to  any  point
  of  destination,  between  which  and  the  point  of  such delivery for
  shipment two or more through routes shall exist,  the  person,  firm  or
  corporation  making  such  shipment shall have the right to designate in
  writing by which of such routes such property shall  be  transported  to
  destination,  and  it shall thereupon be the duty of the initial carrier
  to route such property and issue a through bill of lading therefor as so
  directed, and to transport such property over its own line or lines  and
  deliver  the  same  to  the  connecting carrier by rail or water, and it
  shall be the duty of such connecting carrier to  receive  such  property
  and  transport  it  over  such line or lines and deliver the same to the
  next  succeeding  carrier  or  consignee  according   to   the   routing
  instructions  of  such  bill  of  lading,  provided that nothing in this
  section shall be construed to make a common carrier liable for injury to
  or loss of goods in transit on the line of another carrier. The  shipper
  shall in all instances have the right to determine where competing lines
  of  railroad  or  of  carriers by water constitute portions of a through
  line or route, over which of said  competing  lines  so  constituting  a
  portion  of such through line or route his freight shall be transported.
  The commissioner shall have the power to make such reasonable exceptions
  and regulations as he may determine and shall have power to enforce  the
  above  provisions. Where the route adopted by the shipper is by rail and
  water lines, some of which have no  physical  connection,  the  property
  carried  shall be delivered at the point on the route where the transfer
  is to take place by the initial or succeeding carrier to an agent of the
  connecting carrier.