The chap I was talking to was of the opinion ETCS probably would not be implemented on all the track west of Paddington before we retire. I don't know exactly how old he is but I am 53.For clarity, ETCS is the bit currently being implemented on the line from Hayes to Heathrow, and which will eventually be implemented on everything West of Paddington to take over from ATP. All this is above ground.
We have a simulator that can be converted for Paddington to Heathrow service, not Crossrail. That goes through a tunnel as it approaches Heathrow. It has ETCS. I am pretty sure it does not have CBTC, unless it is somehow built into the ETCS system. I had never heard of CBTC before this week.CBTC is being implemented in the tunnel. ETCS needs radio links which can't be established in a tunnel, so CBTC is used again. This is similar to ETCS, but with a bit more experience of moving block signalling, as very tight headways are desired where the infrastructure cost of tunneling (sometimes undersea tunneling) is necessarily high. i.e. it will cost you a lot of money to build a big tunnel, so only really worth it if you run lots and lots of trains down it.