Stadler FLIRT DMUs

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Stadler FLIRT DMUs

Postby electricron » Fri Sep 14, 2018 11:51 pm

TexRail’s, Trinity Metro (ex-Fort Worth Transportation Authority) new FLIRTs being tested on YouTube.
https://youtu.be/5i-pb-AsmNw
TexRail pdf
http://www.texrail.com/about/overview/
Stadler pdf
https://wwwstadlerrailcom-live-01e96f7. ... 5en_us.pdf
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Re: Stadler FLIRT DMUs

Postby electricron » Wed Feb 13, 2019 10:00 am

You can ride DMU versions of Stadler FLIRTs in Fort Worth!
The TexRail line is open for business.
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Re: Stadler FLIRT DMUs

Postby Nasadowsk » Mon Feb 18, 2019 8:00 pm

electricron wrote:You can ride DMU versions of Stadler FLIRTs in Fort Worth!
The TexRail line is open for business.


Wonder how the performance compares to the electric version? I don't suspect the FRA would allow 0-100mph in 75 seconds, even if the things could do it....
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Re: Stadler FLIRT DMUs

Postby electricron » Sun Feb 24, 2019 3:32 am

Nasadowsk wrote:
electricron wrote:You can ride DMU versions of Stadler FLIRTs in Fort Worth!
The TexRail line is open for business.


Wonder how the performance compares to the electric version? I don't suspect the FRA would allow 0-100mph in 75 seconds, even if the things could do it....

TexRail FLIRTs can not reach 100 mph.
TexRail will rarely, if ever, run faster than 60 mph (96 kph) in normal operations. The DMU FLIRTs TexRail bought per Stadler specifications could reach a maximum speed 79 mph (130 kph).

The best answer to your question comparing the specifications differences between an EMU and DMU versions of the FLIRT, this Stadler link for Greater Anglica trains have both- in 3 car and 4 car lengths.
https://www.stadlerrail.com/media/pdf/feabmu0916e.pdf
TexRail uses 4 cars , so let's look at the 4 car version in detail.
Max acceleration electric (0-40 mph) = 1.1 m/s2 (3.6 ft/s2) or 2.45 mph/s
Max acceleration diesel (0-40 mph) = 0.9 m/s2 (2.9 ft/s2) or 1.98 mph/s
Max speed 100 mph
Max electric power at wheels was the same for both the diesel and electric versions, 2600 kW
Therefore, possibly completely wrong algebra - but here I go anyways....
Electric = 40 mph / 2.45 mph/s = 16.3 seconds
Diesel = 40 mph / 1.98 mph/s = 20.2 seconds
I have no idea what the acceleration curves are above 40 mph, so I can't accurately calculate what the time to 100 mph would be. Assuming the same acceleration curve to 40 mph, yes I know a very bad assumption to make but fun never-the-less:
Electric = 100 mph / 2.45 mph/s = 40.8 seconds
Diesel = 100 mph / 1.98 mph/s = 50.5 seconds
So, the diesel should only take an extra 10 seconds or so to reach 100 mph than the electric.
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