anir dendroica
OBS Chief
- Joined
- Jan 2, 2009
- Messages
- 507
Amtrak's impacts on the freight railroads, especially on busy routes, are almost 100% time-domain. Wear on the tracks is negligible compared to 18,000 ton freights.I was thinking that the fees were based on induced costs to the host, ie, wear, ie, x cars produce f(x) wear and 2x cars produce f(2x) wear... though maybe the biggest wear source might be the loco(s). Hadn't considered the cost to the host in terms of the time-domain, but that would also make sense.One car is the same as a dozen cars from the perspective of the host. Once you start exceeding the size of the average platform then the station stops start taking longer for double or triple spotting but so long as Amtrak is able to clear a station in within an agreed upon window the host probably doesn't care about the size of the train itself. If you keep increasing the length of the consist then at some point you'd eventually risk exceeding the size of the average siding for a given route, but we're so far from that point that I doubt we'll ever see such a thing in any of our lifetimes. You could double or triple or even quadruple most Amtrak trains before the host would be incapable of dispatching them due to issues with length.
thanks - greg
Every time a freight pulls into a siding for Amtrak, costs start adding up.
Let's say the average siding dwell time of a freight is 30 minutes, including the time lost during deceleration and acceleration. That's one hour of crew time plus benefits ($150?), 30 minutes of three locomotives idling (3.1 gal/hr * 3 * 0.5 hr *$3/gal = $14), and about six minutes of three locomotives in Notch 8 getting the train back up to speed (185 gal/hr * 3 * 0.1 hr * $3/gal = $166). So that's about $330 in cost to the railroad every time a freight meets Amtrak on a passing siding, or a freight traveling the same direction takes a siding to allow Amtrak to pass.
From Seattle to Minot is roughly 1200 miles, with passing sidings every ~8 miles and freights in at least half of the sidings. That means that over the course of an Empire Builder run, roughly 75 freights need to stop in sidings. At $330 per siding stop, that comes to nearly $25,000 in time-domain and fuel-domain cost.