The latter part of Richard Stentiford's life in Dawlish
would have been dominated by talk of the coming of the railway. All
manner of plans to extend the Paddington to Exeter line were drawn up in the 1830s but public imagination
was caught by what turned out to be Isambard Kingdom Brunels' great
failure - an
atmospheric railway running from Exeter St. David's to Newton Abbot.
The engineering work proved difficult and costly. A wooden viaduct
over the estuary at Cockwood, a spectacular series of tunnels between
Dawlish and Teignmouth and the huge sea wall which Brunel was forced to build
to protect his line took years; there were difficulties in obtaining
suitable land between Teignmouth and Newton Abbot which meant that
the original service terminated at Teignmouth until December 1846. All
bad omens but worse was to come.
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The Atmospheric Railway at Coryton
Tunnel, Dawlish 1847 |
As
Brunel mapped out the route for his line south of Exeter, he must have
realised that because a coastal route was his preferred choice, steam
trains would cause some anxiety in a newly-fledged health resort like
Dawlish.
An
atmospheric railway required no locomotive and produced little noise
with no smoke or dust. In addition, the route chosen had sharp curves
and some fairly steep gradients so atmospheric propulsion would, in
theory, produce greater adhesion. When Brunel brought the system to
South Devon, it had only been tried out experimentally on two short
stretches of line, one in London, the other in Ireland.
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Brunel's
pumping stations on the South Devon Atmospheric Railway system
www.expedia.co.uk
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As
the picture at the top of the page shows, a pipe with a slit on the top
of it ran continuously down the centre of the track - broad gauge at
this time, of course. A piston in the pipe connected with an arm on the
first carriage. All the air ahead of the piston was sucked out of the
pipe by pumps in pumping stations situated at intervals along the route
and the resulting atmospheric pressure caused the train to move forward.
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The
Starcross Pumping station
This
is the last remaining pumping station. The top of the smoke stack became
dangerous and had to be removed.
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Amazingly,
sometimes the system worked. Records show speeds achieved that were
incredible for that point in railway development - 60, even 70 mph in
trials. At other times - too many other times - the system failed
completely and the third-class passengers were expected to get out and
push the carriages along the track to the next pumping station.
Brunel never really solved the problem of halting the train at defined
points like stations and, of course, the builders never took into
account the problems they would encounter with salt spray from the sea
just below the line.
The
trouble lay with the slit in the pipe which had to open as the train
moved forward then close to create an airtight seal behind it. A
well-greased leather flap with metal components was used to create the
seal but continually failed because rats ate the greased leather and the
salt spray corroded the metal components.
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Passing
the Dawlish Pumping Station - 1846
The
train is travelling from Dawlish towards Exeter.
The
Coryton Tunnel entrance can be seen in the background
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Even
if these problems could have been resolved, with hindsight one can see
that the project was always doomed to commercial failure because only one train could ride the track at any given time. The end came less
than 12 months after the full service was launched, with the first frost
of the winter of 1847/8. Brunel's line ran along the very edge of the
coast on an embankment wall over which heavy seas beat relentlessly on
the winter tides. The leather flaps, which in any case, had had to be
replaced on a daily basis in a frantic effort to keep the line open,
froze solid as temperatures plummeted, bringing the venture to an
abrupt and final halt.
The
service returned with steam engines and conventional carriages and the
days of the atmospheric railway were over. Brunel took full
responsibility for what he always considered to be his own personal
failure. It was a personal loss too - he had invested much of his own
money in the project for which he declined to take a fee.
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Coryton
Tunnel entrance today.
The
original tunnel was enlarged to accommodate an up and a down line when
the broad gauge track was removed.
The rebuilt tunnel is now known as
Kennaway Tunnel.
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Back
to Issue 17
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