Reducing cost can take a lot of tweaking to get right, and is likely to take more than one cycle to do. But new schedules do take some bedding in until they are running smoothly. Once that happens, you can then look for the next round of optimisations - tweaks to the way the trains are assembled in the yards which then start building the incremental gains.
If you have a better scheduling system, you build resilience into the schedule. You open up more time for maintenance, you keep your assets in better condition, so you have fewer breakdowns. One thing to remember is that (in general) there is a Pareto on train breakdowns - 20% of the locomotives cause 80% of the problems. It will be the worst locomotives that are taken out of service, so the reduction in service affecting failures should be quite significant.
You make some money on the OPEX side by doing more scheduled maintenance, and less emergency maintenance (overtime is really expensive!). You also make savings on the CAPEX side, because your assets last longer.
. Changed para order
Same in France - allocating freight capacity in a passenger-focused network is tricky. A paper about that (https://tel.archives-ouvertes.fr/tel-01317522/file/TH2015PES...) - in French but with abstract in English:
"Train timetabling on a rail network is a complex task. In Europe, this issue lies within a process for which the infrastructure manager has to consider competing uses – passenger and freight trains as well as maintenance work – and several users of a scarce resource, infrastructure capacity. The aim of this research is to better understand the way this process is organised and works on the French rail network. We have chosen to tackle this issue focusing on freight as an activity which has been opened up to competition since 2006 but has experienced structural difficulties since the 1980s. The various time aspects of the capacity allocation process are the key focus of our analysis. Our approach considers the perspectives of the infrastructure manager and of their customers, foremost among which are train operating companies. We highlight that freight occupies a unique place in this process which is based on a schedule resulting from both European regulations and the legacy of decisions taken at the national level. The issue of the quality of the train paths offered by the infrastructure manager is studied with a focus on the links between short and long term requirements with regard to the train running deadline. In spite of their diversity, we demontsrate that freight operators need flexibility and visibility. Finally, we analyse catalogue paths as a specific offer that aims to guarantee capacity for freight. The German method, through the neXt project, provides an alternative insight into this issue. Accommodating freight train paths into the timetable is essentially a necessary but delicate balance of interests : standardisation vs. customisation."
It's amusing to see a small freight train come rolling through a passenger station with platform. I don't know how they squeeze them in, probably only run off-peak.
Our reluctance to spend the money to separate the passenger and freight traffic - even on the busiest lines - is part of the reason reliability of the network is often under question.
The poor reliability is then used as a reason to limit future investment in passenger lines.
Cant u sort of simulate the expected scenarios and get sort-of expected performance?
I realize there is unexpected events, but these will occur anyway in old and new schedules
Also - does real train software has nice graphics or do u get a boring excel ? ;(
As for software, the optimization of rail slot allocation is far beyond spreadhseets - for the whole French network it is a math-heavy process for which a whole team harnesses a bunch of specialist software. More about the process (in French): https://tel.archives-ouvertes.fr/tel-01423840/document
This is really good.
Hence, each time a schedule changes there is an uptick of accidents, disruptions, missed trains, overcrowding, etc until all adjust to this new timetable.
I think the most telling part of the article
I can come up with a number of different scenarios, with different faults and restrictions. Without knowing deeper reasons I don't know if this is a bad idea (as BNSF claims) that needs to be scrapped or a great idea that just needs to get over growing pains.
Is it that railroads don't have the expertise to do this? Hard to imagine.
Why are railroad execs huddled around a physical table + map trying to propose timings for trains to run through? Maybe the article is simplifying things that makes it sound really inefficient.
As the article states, freight trains used to kind of run "on demand" centered around the customer, which made scheduling efficient train loads hard. Now they're trying to group into a more normal schedule, but this can still be hard as freight loads don't necessarily go point-to-point to their final destination and delays can cascade for switch-overs at hubs.
Source: Have been a long-time investor in a major railway and read the investor reports.
> Now railroads want to run more like commercial airlines, where departure times are set. Factories, farms, mines or mills need to be ready or miss their trips.
> In the US, there are huge bottlenecks around Chicago (where a crazy high percentage of all American rail freight passes through)
To me it sounds like they are already most of the way to the goal :D
This practice of leaving with or without your forecasted cargo reminds me of the software “release train” concept.
Perhaps a mod could update the link?