appropriate and general principle is to assume a simplified model
of the track allocation process, taking into account capacity
constraints, demand and supply, and assume the calculated actual
outcome timetables in the do-nothing and in the investment
scenario. In some contexts, assuming socially optimal timetables might
be a reasonable approximation of what society tries to achieve
through regulations, policies, public transport provision, capacity
allocation, pricing, subsidies, etc. In other contexts, profit
maximizing timetables may be a more realistic approximation.