What connects the Channel Tunnel with Caerphilly Tunnel?

A fun KZbin short. What connects the engineering feat of its day with the Channel Tunnel? And why is this connection now a rail relic?
Music from #Uppbeat (free for Creators!):
uppbeat.io/t/hey-pluto/nod-yo...
License code: QMAFAJIEGPPP060Z

[@Sim0nTrains]

Very nice video and a suprise that it was a Unit which connected both Tunnels

[@letrainavapeur]

Don't know where you dig up these facts Bob but they are very interesting, Pete

[@bobsrailrelics]

I spend way too much time on the Internet 😁 Many thanks

[@MrReakes]

very good bob

[@stephendavies6949]

Lovely story telling, Bob. Enjoyable, entertaining and very interesting!

[@martinmarsola6477]

A historic story about the train. When have never knew it, if it wasn’t for you. Thanks for the video, and see you on the next, Bob! 🏴󠁧󠁢󠁷󠁬󠁳󠁿👍🙂🇺🇸

[@andrewmerriman7133]

A video from you with a difference, thank you for making it, I would never have known about this without your great video. Andrew

[@bobsrailrelics]

I knew the 319's had gone into the Channel Tunnel but didn't realise one ended up down here. A bit of fun ahead of a couple of larger videos. Thanks for watching

[@MervynPartin]

I don't know if you remember seeing the (black & white) BBC technology series "James Burke's Connections", but your story was a worthy successor, Bob. Absolutely fascinating.

[@bobsrailrelics]

That is very flattering. James Burke was a master of his talent.

[@stevieinselby]

It's funny to hear the diesel engine overlaying the whine of the electric motor that I remember from the days of these trains being on Thameslink

[@toast99bubbles]

I travel through Caerphilly tunnel each way to work. Nice to learn some more about it.

[@bobsrailrelics]

It took a heck of a lot of effort to build it. I went through on Monday and I forget how long it is.

[@toast99bubbles]

​@@bobsrailrelics These tunnels are pretty impressive. I wish I'd known this about 769008 when TfW still ran it. We now have the nice 213 FLIRTs, but I would have loved to have asked nively to see the little commemorative plate for myself.

[@joshthomas7190]

Very interesting, thanks Bob!

[@fhwolthuis]

Very interesting story!👍🏻👍🏻

[@WELSH-VIKING]

such a shame a peice of history is leaving the lines would have been good maybe st fagans to get the train as a display that links the tunnels as it modern history