MREX
Listed owner
Marshall Railway Equipment Corporation; Monad Railway Equipment Company
What this mark means
The last letter of MREX is X. That is the AAR convention for equipment registered to a private owner: a lessor, a shipper, or another company that is not an operating railroad. The car can still move in any railroad's train. The mark on the car is the private company's, not the railroad's.
The owner wording comes from the English Wikipedia reporting-mark list, with wiki markup removed. An arrow (→) is a succession of names as that page printed it. A semicolon separates more than one company listed for the same mark. RailcarID does not decide which name is the current one, and it does not attach a build date, a dimension, or a location to any individual car.
Related marks
No closely related marks turned up in this list.
Photos of cars with this mark
No photos are indexed for this page yet.
A later version of RailcarID will list public photos of a specific car on other sites. Each hit keeps the photo page link, the photographer's name, and the source site. A thumbnail is stored only when that source's license allows it. The picture itself stays on the original site.
Look up a car number
Add the number painted next to MREX. You'll get a car page with this mark's owner line and room for photos and sightings.
Source: List of reporting marks: M on English Wikipedia, CC BY-SA 4.0. RailcarID removed wiki markup and split notes out of the owner line. Attribution and the full change note.