I'm not across how it's been implemented on those lines but I know from experience that running mixed systems where you have some lines on CBTC that then then h

I'm not across how it's been implemented on those lines but I know from experience that running mixed systems where you have some lines on CBTC that then then have to interface with older traditional signalling, you can't realize many of those time-saving benefits until you change over the rest of those lines for (among other things) safety reasons.