On Wed, 14 Mar 2007 09:41:39 -0000, Peter Corser wrote:

As an aside you may be aware that the train running numbers (set numbers)
shown in the time table were the direct digital equivalent of a hex number -
477 digital was stored as 477 hex and 477 was the highest number normally
used (there was also nothing between x78 and x99) which also saved bits (ot
sequence machine fingers).

ITYM octal rather than hex...