Posted by Mowgli-dog Just a question for all out there that know more about trains than I do; I live in the Vancouver area, in a suburb near the CP Rail mainline. I see tons of trains on their way in to Vancouver, and on their way out. I often see rolling stock from other railways - CN, BNSF, and some others from the US. I'm sure CP rolling stock finds it's way to these other rail lines as well. My question is, do these companies know where all their rolling stock is at all times? If a CN car required maintenance all of a sudden, would CP just do the work and bill CN? Do these companies ever ask for their stuff back? Thanks!
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Railways can easily trace their equipment, most of the time the system is pretty accurate and can give the location of a railcar once it passes an AEI reader.
Say boxcar CN 123456 passes the AEI reader going into Symington yard, tracing it would "CN 1234 arrived Symington Yard, time+date".
Typically if a load starts off on Railroad A and is going to Railroad B, Railroad A would usually supply the car and it would be shipped and interchanged with Railroad B to get to its final destination. Sometimes once it's arrived and unloaded, Railroad B would look for any shipments headed to Railroad A and ship it in the car, or they could just return it to Railroad A empty but that's not optimizing equipment utilization.
Cars the shipper specifically owns or is leasing, or specialized cars that are limited or assigned to one special commodity might just get returned. General cars like boxcars, gondolas, hoppers etc or cars the railroad owns might just go back into their pool once the load is delivered.