Re: railway sign?

["Jonathan Boles" <mousewithglasses@NO.CANNED.HAM.hotmail.com>]

that is a sign indicating to a driver of a double deck train where to stop.
Does anyone know what 272 and 'BLUE' mean here?

Ann Tuckey <atuckey@pnc.com.au> wrote in article
<387e7e3b@occy.pnc.com.au>...
> I was wondering if anybody knows if the following sign is of railway
> origin,if so what it means and where it may have come from.
> It is a metal sign,painted yellow,with black writing,and measures 46cm x
> 31cm.
> It says:
>                        BLUE
>                          D/D
>                        STOP
>                        HERE
>                                2'72      (numbers in small print)
> 
> Thanks,
>    Ann.
> 
> 
>