Trains began running again into the Mexican Port of Lazaro Cardenas Thursday, two days after protestors halted train traffic at the port, raising anew concerns of reliability of the country’s railroad system in moving freight.

The second-largest terminal at Mexico’s Port of Manzanillo will complete an expansion project next year as the ports fends off complaints it has problems dealing with peak season volumes.

Shippers who find Mexico’s customs system slow, unwieldy, and unpredictable might find hope in a project the Port of Veracruz is about to launch that uses blockchain technology to create transparency for cargo moving through the customs process.

After two bills that would have banned the use of double tractor-trailers stalled in the Mexican legislature, a new proposal calls for cutting the allowable weight of the vehicles.