the reverse of this, the second portion is the faster of the two, catching up the slow train at the point where they join.

Issues

For portion working to be successful, the operator may need to address many issues. For example:

* Locations for coupling and uncoupling must be designated.
* The best combinations of services must be carefully considered.
* Coupling and uncoupling takes time.
* Portion working can transfer disruption from one section to the wider network.

Dividing trains can sometimes

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