SD40-2 8008 & SD40-3 4068 do their best ALCO impersonations as they lead a monster Q241 (9600ft of loaded autoracks) south up the grade through Kennesaw, & thanks to a bad EOT, were limited to 30mph as they climbed the long grade from Emerson to Elizabeth. This was great for the railfans chasing, but I would imagine a nightmare for the crew, especially with them almost stalling at the peak of the summit.
