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Deucey

Why are B-Div cars trapezoidal?

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Before the R44, B-Div cars were square. A-Div cars are square.

Why is it R44 and later have that trapezoidal construction where the top of the cars are narrower than the middle?

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Maybe the design is more aerodynamic?

The BMT tested a vaguely similar shape back in their day with some of the multi-section cars:

millions-bimg_6713.jpg

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But the IRT did have a tapered car 100 years ago as well, the first subway cars, the Composites. Don't know why they they never used a tapered design again; the modern designs (especially the R62) were made to have curved sides, and don't look right with straight sides.

IRT%20COMPOSITE%20CARS.jpg

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On 11/29/2019 at 10:21 AM, LTA1992 said:

It adds more space iirc.

Coincidentally, right where people’s bellies are widest

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Because of where the suspension is, if roof is narrower you can have a looser suspension because the train rocking more wont hit the tunnel walls/conduit/structure gauge.

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2 hours ago, Kamen Rider said:

If you want to get mathematical, they're not trapezoids, they extremely irregular hexagons. 

Fair enough. I took geometry three times and barely passed so...

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