Fan Railer
OBS Chief
- Joined
- Jun 23, 2012
- Messages
- 887
Typically, engineers do not use full throttle coming out of stations unless the train is significantly late and there is not enough padding left in the schedule to help it make up time. Otherwise, leaving a station on 2/3 - 3/4 throttle is plenty sufficient to keep the schedule.Is there a noticeable change in acceleration with the new locomotives? Going from 5100 to 6400 max kilowatts and from 4300 to 5000 kW continuous (ACS-64 vs. AEM-7's) it seems like you might be able to feel the difference leaving the station. Or do the engineers not use anywhere near full power so the acceleration stays about the same?
Especially with the new, more powerful locomotives, leaving stations constantly on full throttle would put the train ahead of schedule by an amount that would disrupt scheduling and potentially cause conflicts further down the line, given the fact that there are still older, less powerful and slower locomotives operating along the line during this time.
In addition, applying full throttle while the consist is stationary may or may not generate wheel slip. So in order to avoid such an occurrence, you typically would not apply full throttle coming out of a stop unless you knew the tracks were nice and dry, and you weren't coming out of a station that was curved (curved track generates more resistance and increases chances wheel slip during high tractive effort applications).
Also, there are many stations from which the Regional departs where there are speed restrictions in the immediate vicinity of the station, so there would be no point in pushing to full throttle right out of the station.
Normally, full throttle would be used when accelerating out of a speed restriction (from say 30 or 45 mph to full line speed of 100+ mph).