BoilerBob wrote:Making up a train before computers must have been a headache!
Well, yeah, but they didn't know any different, right? They had systems that relied heavily upon paper/pencil records that were continually updated manually. Lots of clerks! Lots of little boxes for waybills, like sorting letters in the post office -- a very similar process, by the way. Where have all the clerks gone? They've turned into computer systems!
Pre-electronic data systems, switch crews and yard clerks had their own system of marking the sides of cars with chalk to keep the various "classifications" (car destinations) clear for them as they sorted and made up trains. Just as with today, it was vital to have an inventory of "classified" cars on each track in the yard. Each track of such equipment made up all or a portion of an outgoing "block" of cars that would advance to the next classification yard for further sorting and delivery to destination. It's still the same now, but a lot more efficient and accurate with modern systems.
Railroads were among the earliest industries to take advantage of data processing technology. When I started railroading in the late 1960s they used IBM punchcards to keep track of all of the records involved in moving cars across the system. The hump where I worked actually had an analog computer system that controlled the switching process, automatically routing each car to the track set up for the destination of the car.
They also had a system of teletype machines that transmitted the train information around from location to location. Long before a train would arrive at our terminal, there would be an "advance" list of what supposedly was in that train, with each car designated by the system for a different connecting train out of the terminal.
Even with all of that, the human element would often cause the advance list to be wrong, requiring that the train be visually checked, car by car, by a clerk to verify the list. At the hump yard where I started, they had a system of remote TV cameras so the clerk could just sit in a nice warm room and watch the train go by, writing the initials and numbers of every car. As you brought your train in, the YM would say, "Slow by the camera for track 9," or "Slow it down, the clerks can't read the numbers that fast."
For a time they experimented with an optical scan system, with each car having a color bar code panel on its side that would represent all of the pertinent identification data for the car. This system was an abject failure, for many reasons, and they went back to the visual observation process.
Technology has advanced now to where each piece of rolling equipment has little units on each side (AEI, or
Automatic Equipment Identification) that allow for automated wayside "readers" to pick up the car information in an instant as the train passes at normal speed. These readers are strategically located around the railroad so that the computer system can have a true picture of where every car is on every train almost continuously. Most customers can go online now and find out the last point and time where their cars had passed a reader, much like tracking a FedEx package online.
Here's a story about AEI development:
Here
These days, at interchange points, railroads have their computers set up to talk to each other (EDI or Electronic Data Interchange) so that they know in advance all of the info for every car that comes along. Shippers also have EDI connections so they can notify the carrier when cars are ready to be pulled from their industrial spurs, or when they are ready to accept inbound cars. It's all very sophisticated today, with information flowing continuously between shippers, consignees, and interchanging railroads.
Several years ago, when Wisconsin Central Ltd was spun off by Soo Line, someone in the company who was obviously opposed to the new non-union operation, scrambled all of the car data in the system so that they had no clue about where each car was, where it came from, or most importantly, where it was to go. They were months recovering from this, as you might imagine. What a mess!
I was working as a trainmaster for Conrail in Enola for a while. We had one train that we received from the Eastern Shore (DelMarVa) that brought cars up from Virginia, interchanged from NS. We also had one train that went back there every day. I received a call one evening from an irate NS traffic manager who told me there were several loaded auto racks with new Ford vehicles on them that had been moving back and forth between Enola and the interchange point over several weeks. A mismark in the shipping instructions kept telling our system the cars were empty, and to return them to the origin for loading. Just imagine what that fiasco cost! Fortunately, someone finally noticed!
Railroads today could not operate for a day without their extensive data processing systems.