With the advent of 3-D printers, they may be the future of Toy Train Manufacturing.
I came across this story about someone having built a Big Boy with a 3-D printer.
Very cool & wonderous possibilities!
http://www.thingiverse.com/thing:259005Happy Rails!
Dave
And that was just a makerbot! Imagine what we could do with a Siemens Lazermetal 3D Printer that SpaceX uses to build rocket parts.