Heat orders will slow MARC trains

The Maryland Transit Administration reports that CSX has issued heat orders for Monday afternoon from 1 to 7 p.m. This will affect trains on the Brunswick and Camden lines, which will operate 20 miles per hour under their normal maximum speed. Officials said trains won't travel at less than 40 mph, but delays can range from 10 to 15 minutes.

According to the MTA's Web site, heat orders are issued "whenever temperatures are forecast to reach near 90 degrees or in the event that temperatures have increased by 30 degrees." Track components can expand in the heat causing shifts in the rails.