Service start at 07:38, dobbelstock car, from Gemünden to Aschaffenburg. At Heigenbrücken I'm held by a red signal because an AI freight train, hauled by a BR155, needs to pass. This train passes at approximately 08:17, which is the time I should have arrived at my next stop at Laufach 6.5km down the line. There's no way I can make that in time. The signal at Heigenbrücken clears at approximately 08:18. EDIT: BR204 DLC is installed. Not sure it makes a difference though.
