Third,there is some literature that at least implicitly indicates
the specific problem of the present paper. Adler etal.(2010) study
how competition between airlines and high speed railmay affect
service levels,and how this affects the benefits of high-speed rail
investments .There is an insight of the problem that the assumed
timetables affect the utility of rail investments although no explicit
discussion of or solution to it,such as an explicit principle for
timetable construction in appraisal,is suggested. Bristowetal.
(1998), Nash and Preston(1991) and Nash (1992) all touch upon
relate disuses when discussing and analyzing appraisal principles
in the partially deregulated British railway industry.However,
there is no explicit formulation of the problem or suggestions on
how it can be solved.