The Manzanillo Rail Tunnel, due to be completed next month, may help to revitalize Mexican rail traffic in terms of international trade. By providing an alternative east-west link it could displace Panama Canal activity for Mexican volumes – something the Canal can ill afford after a 3% drop in traffic in the first quarter on a year earlier. Mexican rail shipments have also been in decline, with a 13% slide in the first quarter after a 5% expansion in 2017 and 7% annually for the prior three years. That’s been caused by the automotive sector – the largest inbound user of r...