Heuristics for the service network design problem for freight transportation

I need a literature study on the service network design problem (SNDP) for rail transportation. The writing style should be of academic level and must contain at least 12 references. The idea is to review current algorithms/heuristics that are used to solve the SNDP for rail transport or similar problems.
I am attaching a short introduction that I wrote on the topic I requested, together with some reference material that may be interesting to use in the writing process. Please have someone look at it.

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