BOGOTA--Workers at Colombia's main railway for coal exports went on strike Monday, adding to a five-day strike at the coal mines of the local unit of Glencore International PLC (GLNCY, GLEN.LN).

"The railway workers from Fenoco have also now agreed to strike, they started at 6 a.m.," said Alfredo Tovar, a leader of the coal workers union Sintramienergetica, said by telephone.

Officials at Fenoco weren't immediately available for comment.

The Fenoco railway company in the northern state of Cesar is used to haul coal for Glencore as well as that of Goldman Sachs Group Inc.'s local unit CNR, Brazilian mining giant Vale SA (VALE, VALE5.BR), and Alabama-based Drummond. It transports around 40 million metric tons of coal a year for export, more than half Colombia's total shipments, Tovar said.

Tovar said that with the railway shut down, it's possible these companies could use 18-wheelers to move their coal moving toward ports. But he said he doubts they could "even come close" to what the trains transport, in terms of volume.

Colombia is among the world's top coal exporters. It produced 87 million metric tons of coal last year and was hoping for nearly 100 million tons in 2012.

Unaffected by the coal miners' strike in the state of Cesar are operations at Cerrejon LLC, Colombia's largest coal exporter, which is equally-owned by Xstrata PLC (XTA.LN), Anglo American PLC (AAUKY, AAL.LN) and BHP Billiton Ltd. (BHP, BHP.AU).

The workers at Glencore's La Jagua mine that went on strike Thursday are seeking better wages. Workers at other Glencore-held mines in the area also joined in the walkout, in solidarity.

Tovar said his union remains ready to sit down and iron out a deal on wages, health benefits and other issues, but said that as of Monday morning he hasn't heard from management.

-Write to Dan Molinski at dan.molinski@dowjones.com

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