The 86 meter long, 1888 ton self-propelled barge Alma Zevenaar suffered an engine fire while on the Rhine River near Tolkamer, Netherlands.   The Alma was proceeding to a shipyard after an incident the week before when the fire broke out.   The vessel headed for a nearby quay where local firefighters were able to extinguish the blaze.   Reports state the fire destroyed the wheelhouse, but the living quarters were saved.   Damage to the engine room was not reported.   All on board the Alma were uninjured.   The cause of the fire is under investigation.