“Constant Flow Rate” Yet another in the never-ending stream of coal drags departs Brunswick, eastbound, on Sunday afternoon, December 6, 1987 at 14:52. With CSR/C&O SD50 8574 and B&O GP30 6967 on the head end, there’s also helpers on the rear, which will be cutoff after surmounting Parr’s Ridge; that is, Mt. Airy, if it’s to be routed the OML (most likely), or Barnesville, if routed via the Met.