The French counterpart, the Avelia Horizon, looks to have straight-sided cars.
https://lerail.com/storage/Local Press Files/5725/thumb-5725.jpg
I tweeted at Alstom yesterday evening asking... but they've not responded (I don't expect them to).
peter
It’s been a while, but I am pretty certain that I remember reading that the Alstom (Avelia Liberty) Acela trains were going to be the first to use the latest generation of short power cars with others to follow such as the Horizon. Based on that, these could be plausible:
1. They were designed to the most restrictive combination of loading gauges. Hence, the slab sides to match the Horizons.
2. To make design etc. easier, Alstom might have decided not to add special side fairings and spoil commonality.
3. The Acela cars are tilting. The non-tilting power cars are not going to smoothly fair into the passenger cars as the cars tilt even if they did when they were straight.
4. The front edge of the first passenger car may be in the train’s boundary layer and not as important from a resistance perspective.
5. A quick look at newer Japanese Shinkansens shows very strange noses because of aerodynamics with tunnels being especially annoying. I don’t think the tunnels are the driving factor on the NEC, but straight resistance should be. Unfortunately, physics doesn’t care about aesthetics.
6. Drawings do show a pretty substantial crash energy absorption system in the nose of the Alstom power cars. This probably had a noticeable effect on the design also.
Just a few suggestions.
BTW. The few non-rail fans I showed pictures of the new Acela to were positively impressed. We may be prejudiced toward the looks of an EMD E or F. Or, in my case, late New York Central steam.
TTFN.