Function NormaliseDualHeads

src/train_cmd.cpp:938–954

* Normalise the dual heads in the train, i.e. if one is * missing move that one to this train. * @param t the train to normalise. */

 * @param t the train to normalise.
 */
static void NormaliseDualHeads(Train *t)
{
	for (; t != nullptr; t = t->GetNextVehicle()) {
		if (!t->IsMultiheaded() || !t->IsEngine()) continue;

		/* Make sure that there are no free cars before next engine */
		Train *u;
		for (u = t; u->Next() != nullptr && !u->Next()->IsEngine(); u = u->Next()) {}

		if (u == t->other_multiheaded_part) continue;

		/* Remove the part from the 'wrong' train */
		RemoveFromConsist(t->other_multiheaded_part);
		/* And add it to the 'right' train */
		InsertInConsist(u, t->other_multiheaded_part);
	}
}

/**
 * Normalise the sub types of the parts in this chain.