RIGHT TUNNELLING PCL revenue for the last year amounted to 3.14 B THB, the most of which — 3.11 B THB — came from its highest performing source at the moment, Construction, the year earlier bringing 2.02 B THB. The greatest contribution to the revenue figure was made by Thailand — last year it brought RIGHT TUNNELLING PCL 2.98 B THB, and the year before that — 1.97 B THB.