Freight rail electrification is a very interesting topic, and that article really got me thinking. In the future, in an oil- and carbon- constrained world, we are going to need electrified freight rail. Because of the huge infrastructure investment, I think it will take government investment, at least at the current fuel prices. Push fuel prices up a few bucks more, and things start to look rather different. The other reason that it's going to have to happen is the staggering scale of the oil and carbon savings. While we develop better electric cars, we could take a big chunk out of US oil usage with an increased percentage of US freight traffic moved by trains (largely with intermodal and transload sites and short truck hauls at the ends) using technology that was developed 99 years ago by the NYNH&H. Yes, 25kV/60 with computer-controlled 8000hp locomotives running in DP is a little different than the New Haven's original configuration with box cab locomotives and 11kV/25, but the basic idea of electrification with step-up and step-down transformers was developed by 1914.
This site has a rather interesting idea:
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I'm not sure that putting whole trucks and their drivers on trains would make much sense, nor would HSR sets like Acela running with heavy freight traffic, and their map is based off of DOD maps that have strategic routes with little relation to general traffic flows, but the general idea is good. A national system (comprised of the current private railroads) with domestic stack clearances west and north of the NEC, double- triple- or quad-tracked mainlines, 110mph mainlines for express trains with 79mph freight running for hotshots, fully grade separated would be the ideal. I do think that in the future, we should build separate 230mph HSR lines, and not try to run one system. We need true HSR, and then the electrified freight lines can serve for some more regional/localized service for Amtrak with frequent stops with 110mph running in-between so that they don't get too badly in the way of freight, and provide more local service than HSR routes can. Access into the northeast is going to be tricky. A ton of work would be required to clear the line from Selkirk to Worcester for stacks under the wire, we need the NYC freight rail tunnel with stack clearances to Maspeth via NJ, and then COFC spine car service or fillet'ed stacks connecting Maspeth, Cedar Hill, Worcester, Albany, and maybe Davisville and somewhere near Hartford/Springfield together. But that's getting way ahead of the overall freight rail electrification concept.
Some of the key features that they have should be incorporated into a big, nationwide system, plus a couple of my own:
1. 25kV/60 electrification
2. Full grade separation
3. 2 3, or 4 tracks
4. 110mph trackage, concrete ties, CWR
5. A series of passenger stations for Amtrak type of service
6. A series of power change points with freight yards to break off to secondary lines
7. More intermodal ramps and transloading facilities to get freight closer to where it needs to go
Once some sort of incentives are offered by the government and one railroad takes the plunge, I think there will be a domino effect with others in other areas going electric, and then competing routes going electric as well to compete. The BNSF Southern Transcon is the likely first project, even though it would be a huge project. Others will follow. It's going to be a lot cheaper out west, where there are far fewer tunnels, although some routes will still have a lot of clearance issues to overcome in order to get the clearance required for 25kV/60.
While the technology itself is there, there are some other challenges with electrification and modern railroads that have never been addressed. One is that you cannot physically load a stack train under the wire, which means you either have to have diesel helpers to tow the train into the loading/unloading track, or a yard where diesel switchers (we're not actually talking switchers, think a pair of repowered computer-controlled SD-40's) pick trains up and bring them to be unloaded and visa versa. The reality is that it will depend on how much room is available. At some sprawling facilities, there are yards available to switch, while on others, the train will crawl right up to idling diesel helpers on the track, couple up, and go into the container facility. There are some other applications where loading electrically powered trains may be tough, to figure out, like unit grain trains. Many other types of trains are switched at the ends anyways, so they wouldn't really be affected by electrification.
Another is in terms of the routes. There are going to have to be a number of power-change points in order to run on and off of electrified lines, unless a lot of really expensive dual-modes are purchased. Local freight on the mainlines will also have to stay diesel, as they have to be able to go into sidings and such that aren't electrified. Building something like the steel interstate would help route-wise, as it makes a fast, efficient backbone, where freight would be routed to the nearest steel interstate electric changeover point, not the shortest route, as running a longer route and avoiding diesel running would be more efficient than running diesel on the shorter route. This, however, brings up another problem if there is going to be government funding involved. The government is going to have to spread the money around amonst all four major railroads, as otherwise one may feel left out, as traffic will shift to the electrified lines that are cheaper to run on, even if they are somewhat circuitous.
I wouldn't be too worried about switching fleets from diesel to electric. While big six-axle power can't be trickled down to secondary lines and shortline operators like the Geep's and SD-40's of the past, the early Dash-9's and similar are already totally worn out, so moving new orders to electrics and starting to retire some older diesels won't leave diesels with nowhere to go, as a gradual electrification process will take decades, and will still leave plenty of lines needing diesel power.