What a reporting mark tells you
The reporting mark is the short code that identifies the car's registered owner. An X on the end usually means that owner is not a railroad.
A mark is an identity, not a story
A reporting mark is one to four letters, sometimes with an ampersand, assigned to a railroad or to another company that owns cars. It is painted large because it has to be read from the ground. The number after it is that owner's car number. TILX 25580 and GATX 25580 are different cars, because the mark is part of the name.
The mark tells you who the equipment is registered to, in the wording of the open list on this site. That list is compiled from Wikipedia. It can be out of date, and a mark can be reassigned over the years. The mark does not tell you what is in the car today, where the car is going, or where it is right now.
The last letter
An X on the end is the usual mark of an owner that is not a railroad: a leasing company, a shipper, or a private car line. GATX, TILX, and UTLX are that pattern. Railroad initials are the rest, such as BNSF or CN. The rule is a habit of the marking system, and a few marks are exceptions, which is why each mark page on this site quotes the list instead of guessing from the last letter alone.
A U on the end is usually a container. A Z is usually a trailer. Those are the pieces that ride on flatcars and well cars, and they have marks of their own. The car underneath has a different mark.
What to do with one
Look the mark up before you interpret the rest of the car. The mark page gives the owner wording and what the suffix usually means. Add the number and you have the car page, which is where photos, public sightings, and notes collect.
If you are standing next to the car, the scanner can read the mark and number from a photo. Confirm the letters before you trust them. Paint, glare, and a dirty lens all invent letters.
Common questions
- What does the X in GATX mean?
- An X at the end usually means the owner is not a railroad. GATX is a private-owner mark. The owner line on the mark page is the list's wording, not a guess from the X alone.
- Does the reporting mark say what the car is carrying?
- No. The mark identifies the registered owner of the equipment. A placard, when there is one, speaks to the hazard of the load. The car-type code speaks to the kind of car.