Nachoman's 2010 spring bash chalenge

[doctorwayne]

Don't forget, Kevin, that on the prototype car, the frame between the bolsters is only the part under the centre of the tank. The "frame" along the outer edges (sitting atop the cross bearers) is actually a walkway and serves no structural purpose.
Here's a similar car that perhaps illustrates this better:


And here's one that has only the centre frame, with no stub sills, as on the car above, at the ends:


Wayne