Chapter XXXI: Section 4: Long and short haul clause: "That it shall be

unlawful for any common carrier subject to the provisions of
this act, to charge or receive any greater compensation in the
aggregate for the transportation of passengers or of like kind
of property, under substantially similar circumstances and
conditions, for a shorter than for a longer distance over the
same line, in the same direction, the shorter being included
within the longer distance; but this shall not be construed as
authorizing any common carrier within the terms of this act to
charge and receive as great compensation for a shorter as for a
longer distance: _Provided_, _however_, That upon application
to the Commission appointed under the provisions of this act,
such common carrier may, in special cases, after investigation
by the Commission, be authorized to charge less for longer than
for shorter distances for the transportation of passengers or
property; and the Commission may from time to time prescribe
the extent to which such designated common carrier may be
relieved from the operation of this section of this act."