Thomas Cook not in happy place at present, another sign of evolution of travel and holidays.
The Eastbourne rail crash
https://en.wikipedia.org/wiki/Eastbourne_rail_crash is an example of how things have changed since the 1950's. I don't think anybody can now imagine a sleeper from Glasgow to Eastbourne, certainly not with only 36 passengers. I don't think you would get many takers on Ryanair if Eastbourne had an airport.
That train was the
Car Sleeper from Glasgow St. Enoch to Eastbourne - they (and Motorail later) did use odd terminals, for several reasons. (And it only had three sleeper cars.) If you can remember what pre-motorway long-distance driving was like, you'll see why by-passing London was a good idea for anyone going to the south coast.
Relatedly (if not much)
SNCF▸ have declared that they will not run any Auto/Train services after this year. This year they only serve the south-east from Avigonon to Frejus, having dropped the Perpignan service after one year. Of course there is no sleeper service on this route (only two of those, without Auto/Train). You have to travel by daytime
TGV▸ , but you car goes overnight before or after.
This might look crazy, but it has survived because it suits Parisians with holiday homes on the Riviera. They can drop the car off and spend that night at home before going to join it, and the inverse. But there are not enough of them to pay for it at current prices, it's hardly a social priority for subsidy, and hiking prices would probably take out most of the demand. So, evolution, again.
SNCF will in future offer what is now available on other routes via a partner (Expedicar.com). I found some though-provoking prices quoted in
Le Parisien* for Paris-Fréjus:
Auto/Train: €266
Road transporter: €504
Professional driver: €832
"Amateur" driver: €98
... or of course you drive yourself.
* While Le Parisien doesn't say, I think the costs of fuel and tolls have to be added to the driver services. Also these "non-rail" prices may not be for guaranteed overnight or on-the-day travel.