WEBVTT
Kind: captions
Language: en

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Tom: I'm on a train, with no brakes, going backwards.

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And not just any train,

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this is Stephenson's Rocket,

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which was built in--

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when was it, Chris?

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Chris: 1829.

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--1829.  Well it's not the original,

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that's in the Science Museum.

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This is a replica from 150 years later,

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that is in the National Railway Museum in York,

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but for all intents and purposes this is Stephanson's Rocket

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and it has no brakes.

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Chris, tell them why, tell them something they might now know(!)

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Okay. When this was built, proper brakes really hadn't been invented,

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you had an handbrake for when you were stood still,

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and we also on this loco have modern brakes,

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because that's the law!

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But we try not to use them,

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we try to be authentic.

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So, the way we'll brake is literally--

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well we're going backwards at the moment--

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so we'll stick it in forwards gear.

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That will put steam into the cylinders on the opposite side

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and bring us gradually to a nice slow halt,

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then we'll just saunter off in the opposite direction.

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Now, it seems like that would damage it, it seems like

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because on a regular gear box when you hit that and put it--

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there we go--

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into reverse, it feels like that should mesh the gears wrongly,

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but that's not what's happening here,

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it's just injecting steam the other way.

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That's exactly right.

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The cylinder moves backwards and forwards like this.

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We just put the steam into the direction that the cylinder wants to move.

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It tries to compress the steam

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and that resistance slows the loco down.

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And so we comes steadily to a stop, like here,

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and then once we hit that,

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it just starts going the other way.

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Hopefully!

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That is wonderful!

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That is how you stop Stephenson's Rocket,

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that is a train with no brakes and that--

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thank you to Chris, Charlie and the National Railway Museum--

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is something you might not have known!

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[Closed captions by MM.
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