A relevant discussion from main GCM thread.
Let
me explain why there shouldn't be a problem with regoes... and why
LTA has created one.
None
of the BSEP buses' regoes at the moment clash with SG, so let's
just look at among each other. (If you want a hypothetical scenario
let's just direct replace the SBS and SMB prefixes with SG --
mostly no clash)
2000-2004: Citaro
3001-3169: A22
3300-3500: B9TL
3501-3523: B9TL and Enviro500
3524-3611: Enviro500
6300-6599: Citaro
Notice that none of them clash, except the 3501-3523 range.
This
would not be a problem, since only a few Enviro500s are going to be
incorporated into the GCM in the first place. We could avoid the
clash of 3501-3523 by simply exempting that range of E500s from the
GCM and using the others first.
The
problem then, is that of the very few E500s that are going
to GCM, LTA
went and picked the ones that clash with
B9TLs! (3501-3521)
Hence
the problem would have been neatly avoided if LTA had simply
allocated the last 21 BSEP E500s to TT instead of the first.