Here's the 7:11 p.m. advisory from MARC on the many delays this evening. With temperatures reaching as high as 105, it should come as no surprise. It probably comes as a relief to the folks running the system that it wasn't a lot worse. And judging by the lack of irate email, MARC riders are being realists about the challenges the system faces in this heat.

# MARC Train 538 to Perryville is operating 15 minutes late departing Seabrook Station.

 # UPDATE: Train 855 expected to arrive Union Station 15 minunte late due to heat inspection, as a result Train 854 ( 6:43 PM departure from Union Station) is expected to depart approximately 20 minute late.

# MARC Train 439 to Washington Union Station is 30 minute late departing Seabrook station.

# Penn Line UPDATE: Due to damaged wires and single tracking, all trains continue to experience delays approx. 30-40 minutes late. Train 436 ( 5:30 PM departure from Union Station) has just left Union Station 40 minutes late.

# Brunswick Line Passengers: Service delay 15-20 minutes due to signal problems.

# UPDATE: All Camden line trains are experiencing approximately 30 minutes delays due to signal and switch problems.

# Attention Camden and Brunswick Riders: CSX has issued heat orders for this afternoon starting at 1:00pm, until 7:00pm. Trains on both lines will operate 20 miles per hour under the normal maximum authorized speed but not less than 40 miles per hour. Delays can range from 10-15 minutes. We apologize for any inconvenience.

The forecast is for 100-degree temperatures again tomorrow. Wise MARC riders will plan for the worst.