About a year and a half too late, but...
The UMP Railroad still operates in Conshohocken at the old Allenwood Steel Plant. The mill became Lukens Steel, then Bethlehem Lukens Plate and now it is named something else. The UMP actually has nothing to do with the Chester Valley Branch or the EPRY, other than the fact that, last I knew, the UMP 9008 was the motive power on that branch.
In addition to the mill in Conshohocken the UMP services a chemical plant, the Philadelphia Enquirer
newspaper and a scrap yard.
is a map of the area. You'll notice the bridge crossing the Schuylkill River. On one side is the mill and the scrap yard and on the other is the chemical plant, newspaper and NS interchange.
Hope this helps!
--Jim, Former UMP Train Operator