246 Supply Chain Management and Logistics
The BM can be extended to handle the multiple eets. This is done by intro-
ducing a new set of available eets, I, and increasing the dimensionality of
parameters and variables with eet index. For each train in eet i ∈ I, we have
a set of C
i
seat classes, and the number of seats available for class c
i
is n
. For
a train of eet i departing at t, there is a xed train operating cost e
. Dene
as the binary variable such that
t
i
if the train of eet i departing at time t is
selected in the result schedule, and 0 otherwise. Dene
ccjt
i
′
as the binary vari-
able such that v
ccjt
i
′
if c-class seats are allocated for the spilled demand from
class c′ for journey j in the train of eet i depar