An anti-coal activist, whose five-hour protest on a Queensland coal train cost the freight company Aurizon $1.3 million, has fronted court.

Jaxom Kerlin, 18, was granted bail in the Brisbane Magistrates Court on Saturday after he stopped the moving coal train and climbed onto a carriage in Brisbane earlier in the week.

He was charged with obstructing a railway, trespass and obstructing police after he was coaxed from the carriage by police.

Outside court, about a dozen climate and anti-coal protestors gathered to support Kerlin.

One protestor brandishing a banner saying "climate emergency" was arrested by police.

Kerlin is due to reappear in the same court on May 1.

AAP