Comfortable Coach tours. Guaranteed.gbk is the Coach Association of Comfort and Quality in Germany. The association has about 500 member companies nationwide, thereof 420 coach operators. For over 40 years gbk stands for the quality assurance for coaches & coach travels. The main purpose is the certification of coaches with the RAL seal of quality. 5 star-classes offer clearly defined criteria, transparent quality levels and verifiable standards for customers.
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