It's not about speed, the software is about keeping track on all the stuff on the various cars, no mean feat"
Also the management of rail cars, train building, track scheduling, special route planning and on and on. Moving freight in the US is super cheap by rail. Yes, it's faster to ship via lorry even across the country, but that's not a good idea if the trailer is stuffed with cheap Chinese tat and the cost of transportation is going to double the cost of the item.
Passenger rail in the US runs mostly on lines leased from the freight companies. This means that those trains have to be integrated into the system and not delayed too much. Some freight trains that carry fresh foods, "The Lettuce Express" are given top priority so scheduling software has to be able to accommodate that. If you can "acquire" the algorithms for all of that rather than having to develop it yourself, that could be a very big savings.
The article isn't too specific about the type of software that was taken.
I'd like to see the passenger train system in the US upgraded and expanded. I loathe flying these day and much prefer a nice ride on the train. The US doesn't really need HSR as much as it needs to have highER speed rail. Give the size of the country, it's either a tiny bit of HSR that serves a few or highER that can be added for far less that can cover many more stops. Price is a problem too. I can make long trips for less money and arrive sooner than many trains even when spending a night or two at a motel along the way. Americans have been sold a bill of goods with flying everywhere and being in a rush all of the time.