Holding down the manifest schedules in Michigan have been the new AC power 

that CSX has acquired from GE. Generally, R326/327 have the AC's solo up

front most of the time, while R334/335 and 336/337 have a 50/50 mix of

either solo AC's or a pair of 6-axle EMD's. Older GE units, especially

4-axle GE's, are most likely to appear on the trains to and from Walbridge.

However, this is not a frequent occurrence these days.