Thanks for all your responces i really appreciate it.

The only thing i wouldnt understand now is why the London Underground would
actually BUILT/ORDER 3 trains just so people can choose "color" and "design"
and after they choose one then they got to chuck away all the set !! it isnt
very financially-wyse is it ?

Plus that whenever new vehicles are involved either busses or trains i thought
the compoany takes decisions themselves and instead of building prototypes they
just choose one design order 100 makes of it then they release it

Thats what happened anyway for trains in waterloo and northern, there were no
prototypes.

thanks a lot