There are several other advantages using two locomotives besides higher maximum sustained speeds.
(1) Higher reliability, in case one locomotive encounters a failure.
(2) Two cabs, one in each locomotive on opposite ends of the train means not having to build return loops or wyes to turn the train around.
Of course, having a cab in a coach would provide this (2) advantage as well, but not advantage (1).
(3) with FRA compliant locomotives on either end, the possibility FRA will allow lighter built coaches increases. (3a) Lighter coaches means lower operating costs due to lower weight. (3b) Lighter coaches means faster accelerating and decelerating, achieving faster average speeds.
(4) Two locomotives means more horsepower, allowing faster accelerating - and due to twice the counter EMF in the twice as many electric motors, faster decelerating too.
(5)Don't forget, the last 40 miles into Orlando will be single track - even a gain or loss of just two minutes (four minutes roundtrip) can affect train scheduling.

40 miles at 125mph is more like 20 minutes not 2 minutes.

Actually, 40 miles at 125 mph is 19 minutes and 12 seconds. And 40 miles at 110 mph is 21 minutes and 49 seconds. The difference between the two train speeds is 2 minutes and 37 seconds....

That's the two minutes being discussed earlier. Is basic mathematics too difficult to discuss around here?

I am no expert on trains more interested in this story
about the Miami/Ft Laud/WPH stations and development.
I don't think you need two trains because you cant turn around
that sounds stupid, pretty sure trains can go forward and reverse
I think tri-Rail has 2 train engines.
Anybody know about the new WPB station re-design ???

that 40 miles of single track, very important for the extra speed
so the next train can arrive in the other direction.....
also the single track ? if they expand to Jacksonville
will this cause a problem for more trains?
actually the Jacksonville trains maybe less then the 16/16 trains
more like 8 north to daytona 8 south to the airport

He was saying how long 40 miles approximately takes at 125mph, not the differences between 110 and 125.

BTW more info on the trainsets here (as 202 mentioned great opportunity to create American jobs!):
http://www.cnbc.com/id/101992801

Really? What Hatman wrote initially, as I quote;
"40 miles at 125 mph can be covered in just over 19 min., while at 110 it takes just over 21 min., both not counting time to accelerate to top speed.
2 minutes doesn't really make a big difference - not enough to justify a second locomotive."

I don't really care either way but I was talking about what lrt's friend said.

Wave streetcar loop proposed for Flagler Village
 

http://touch.sun-sentinel.com/#secti.../p2p-81316808/

the AAF tv commercial is great seen it tons of times very good
Now there is a new Siemens tv commercial
not about florida , but about trains
very patriotic makes you feel good about made in the USA
This AAF project is a slam dunk

if anybody wants good quality info on AAF
check out reasonrail.blogspot.com

Great link.
The horse-power per ton for two locomotives and seven coaches makes sense to me. Also, everything Electricron said before. I'm on board with this idea now.
Also, I like how everything is being designed for future 9-coach trains. And how the tickets have a boarding door for 1-minute long station dwells. The more I learn about this project the more I love it.
But there is one question I have that hasn't been answered... In building the line from Cocoa to Orlando, are they designing for an eventual second track, or do they think it will always be single-track? I don't see how there could be any higher frequency than 1 hour headways without a second track.

Glimpse of Siemens Charger and Viaggio coach model at Innotrans 2014 in Berlin:


https://farm3.staticflickr.com/2944/...29e93433_b.jpg
><><

If it takes roughly 20 minutes for a train to traverse the distance, doesn't that mean that it's more like 5 trains every two hours that can come or go on that segment?

And wouldn't they be able to do like a passing zone in the middle to boost frequencies?

It could be three trains every hour with 20 minutes elapse times over the single track.

Yes, a passing siding midway in the single track milage potentially allows doubling the number of trains per hour.

In either case, only if every train was absolutely on time. Which only happens in Japan systematically.

Yet, they only require two trains per hour, one in each direction, as stated in their EIS. For initial operations, a passing siding isn't needed on the single track milage. But that doesn't mean they will not build one - or two.

The 20 minutes we're talking about was arrived at assuming a constant speed of 125 miles per hour - so if we were to count time to accelerate up to speed and then decelerate, we may arrive at a figure closer to half an hour.
I'm not sure a passing siding would be the best solution, because it means one train has to slow down to switching speeds. I don't know what the speed limit is for high-speed switching tracks internationally, but here in the (western) USA I haven't heard of one that diverges at a speed greater than 45 miles per hour. That's about one third of the 125 mile per hour speed limit. The point being that a passing siding would make the journey even slower. That may be a price AFF is willing to take to increase capacity, but making a 3 hour trip even longer is rarely a good marketing strategy.
I hope something is done eventually to allow an increased frequency during peak hours. It's no good turning customers away at peak hours and having empty seats during non-peak hours.

Also, AWESOME picture Busy Bee. I like the look of that train. It looks like the Locomotive is as long as the passenger car? I like long locomotives (I'm a fan of the old E units of the streamliner age). It's just so much cooler when the locomotives match the cars in all dimensions, including length - it really makes the train look like a complete set rather than a hodge-podge of the cheapest available equipment.

Any recent construction pictures?

Please be patient. Give it some time. They will working on it.

It looks like the railjet in Austria.

Railjet is very cool-looking. It's got nice matching lines down the whole train, and the cars are probably the same ones AAF is getting. But I hope the ends are more streamlined than the Railjet, because the 'shovel-nose' look of the railjet consist doesn't exactly scream 'speed!!!' to me.
https://encrypted-tbn3.gstatic.com/i...NkWMm-djU3BR9g

I hope the design from that video AAF released makes it through to final production. It almost looks like the ICE 3/Velaro, but a diesel locomotive:
http://mediaassets.tcpalm.com/photo/....0_640_480.jpg
Video Link:
https://www.youtube.com/watch?v=jhG5ImwYBYg

Second Phase Of Miami-Orlando Rail Line Could Also Be Privately Financed

http://i.imgur.com/P3Ct8XC.jpg

From the All Aboard Florida website:

====================================
October 7, 2014
http://www.exmiami.org/index.php/sec...tely-financed/