Mankato firefighters were kept busy Wednesday morning with two different calls. The first call came in around 9:30. A Union Pacific train had stopped at the entrance to Land of Memories Park because a dynamic brake unit on one of the locomotives caught fire. Train employees were in the process of putting out the fire when firefighters arrived. The second call came in around 10:45. A semi and trailer had caught fire on St. Andrews Court near the Microtel off Victory Drive. They had just delivered vehicles to a local dealership. The semi was considered a total loss. No one was injured in either incident.