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Grande, Zacarías. Torralbo, Julia. Lobera, José Manuel. Sánchez-Cambronero, Santos. Castillo, Enrique.

3. Conclusions

Once the previous examples have been performed, the main conclusions are that the Alternate
Double-Single track projects allow to:

• Minimize the construction cost with reduced travel times.
• Design railway lines under current and future demands.
• Define railway alternatives which not impact seriously over the environment.

• Reduce maintenance costs.
• Optimize timetables and improve significantly the current services travel time.
• Model the timetable and the line layout in response to premises of the network.

The case studies have been developed assuming a demand clearly above to de actual one.
Despite of that, the ADST alternative provides a solution with far enough rail capacity for all its
expected operational life

4. Bibliography

• Amit, I. & Goldfarb, D., 1971. The timetable problem for railways. Developments in
Operations Research, Volume 2, pp. 379-387.
• Assad, A., 1980. Models for rail transportation. Transportation Research Part A, Volume 14,
pp. 205-220.
• Burdett, R. L. & Kozan, E., 2010. A disjunctive graph model and framework for constructing
new train schedules. European Journal of Operational Research, Volume 2010, pp. 85-98.

• Cacchiani, V. & Toth, P., 2012. Nominal and Robust Train Timetabling Problems. European
Journal of Operational Research, Volume 219, pp. 727-737.

• Caprara, A., Fischetti, M. & Toth, P., 2002. Modeling and solving the train timetabling
problem. Operations Research, Volume 50, pp. 851-861.

• Carey, M., 1994. A model and strategy for train pathing with choice of lines, platforms and
routes. Transportation Research Part B, Volume 28, pp. 333-353.

• Carey, M. & Crawford, I., 2007. Scheduling trains on a network of busy complex stations.
Transportation Research Part B, Volume 41, pp. 159-178.

• Carey, M. & Lockwood, D., 1995. A model, algorithms and strategy for train pathing. Journal
of the Operational Research Society, Volume 46, pp. 988-1005.

• Castillo, E. et al., 2015. An alternate double-single track proposal for high-speed peripheral
railway lines. Computer Aided Civil and Infrastructure Engineering, Volume 30, pp. 181-201.

• Castillo, E., Gallego, I., Ureña, J. M. & Coronado, J. M., 2009. Timetabling optimization of
a single railway track line with sensitivity analysis. TOP, Volume 17, pp. 256-287.

• Castillo, E., Gallego, I., Ureña, J. M. & Coronado, J. M., 2011. Timetabling optimization
of a mixed double- and single-tracked railway network. Applied Mathematical Modelling,
Volume 35, pp. 859-878.
• Castillo, E., Grande, Z., Moraga, P. & Sánchez Vizcano, J., 2016. A time partitioning

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