Like all modern cars, and unlike most older trains in the US, the Venture cars have crumple zones at each end, or crash energy management as Siemens calls it. These are designed to absorb energy in a crash, protecting passengers from some of the impact.
In addition to seats, there will be an ADA-compliant bathroom. Under the floor will be the electrical equipment and a compressed air container for the braking system. The windows are larger than what you'd find on older Amtrak trains.
In the fore- and mid-ground is Siemens's test track, which has AC and DC power lines. In the background rumbling past is a long Union Pacific freight train. I didn't catch the number, but I'd like to think it was pulled by the same 7419 GE Evolution locomotive I saw when I took the Coast Starlight 39 hours from LA to Seattle.
You may have been wondering, as I was at this point, how Siemens transports vehicles around the factory. (There aren't rails everywhere in the facility.) Here's the answer: Essentially, a highly agile powered dolly can hold an entire car or locomotive.
The Cummins turbocharged 95L V-16 engine produces 4,400 horsepower, but that's not what directly moves the train. Instead, it's a diesel-electric, where the engine is connected to a generator, which in turn powers electric motors that drive the wheels.
Four of the standard six axles are driven for a top speed of 65 mph (105 km/h), though that varies depending on specific metro system. Usually it's a three-cabin design, with two mirror-image end cars, and a smaller central car, with around 60 to 70 seats total.