"Bob" wrote in message
oups.com...
The Central London Railway began with Camel Backed Electric locomotives
hauling unpowered carriages. In order to improve efficiency distinct
humps (mini summits) were built into the track profile at stations from
Notting Hill to Liverpool Street - incoming trains were slowed by the
rising gradient whilst outbound trains were hastened on their way by
the falling out bound gradient. The heavy unsprung locomotives were
soon replaced by multiple units with intermediate powered bogies. Does
anybody know if humps are still built into station tracks on new tube
lines.


Howson's book on the Underground [1981] describes the Victoria line as being
built 'on a hump or sawtooth profile'; it is likely that the Jubilee line
was built with the same falling and rising gradients.

Paul

In article , (Paul Scott) wrote:

"Bob" wrote in message
oups.com...
The Central London Railway began with Camel Backed Electric
locomotives hauling unpowered carriages. In order to improve
efficiency distinct humps (mini summits) were built into the track
profile at stations from Notting Hill to Liverpool Street - incoming
trains were slowed by the rising gradient whilst outbound trains
were hastened on their way by the falling out bound gradient. The
heavy unsprung locomotives were soon replaced by multiple units with
intermediate powered bogies. Does anybody know if humps are still
built into station tracks on new tube lines.

Howson's book on the Underground [1981] describes the Victoria line
as being built 'on a hump or sawtooth profile'; it is likely that the
Jubilee line was built with the same falling and rising gradients.

Not everywhere, presumably because of other constraints. The approach to the King's Cross St Pancras Victoria Line platform from Highbury and Islington is downhill into the platform.

--
Colin Rosenstiel

"Colin Rosenstiel" wrote in message
...
In article ,
(Paul Scott) wrote:

"Bob" wrote in message
oups.com...
The Central London Railway began with Camel Backed Electric
locomotives hauling unpowered carriages. In order to improve
efficiency distinct humps (mini summits) were built into the track
profile at stations from Notting Hill to Liverpool Street - incoming
trains were slowed by the rising gradient whilst outbound trains
were hastened on their way by the falling out bound gradient. The
heavy unsprung locomotives were soon replaced by multiple units with
intermediate powered bogies. Does anybody know if humps are still
built into station tracks on new tube lines.

Howson's book on the Underground [1981] describes the Victoria line
as being built 'on a hump or sawtooth profile'; it is likely that the
Jubilee line was built with the same falling and rising gradients.

Not everywhere, presumably because of other constraints. The approach to
the King's Cross St Pancras Victoria Line platform from Highbury and
Islington is downhill into the platform.

Colin Rosenstiel

I'm sure that is implied elsewhere in the text, and with the Victoria line
at KX being the 4th or 5th pair of tunneled tracks I guess there would be
many problems for the routeing of the tunnels past existing infrastructure.

Paul

In article , (Paul Scott) wrote:

Howson's book on the Underground [1981] describes the Victoria line
as being built 'on a hump or sawtooth profile'; it is likely that
the Jubilee line was built with the same falling and rising
gradients.

Not everywhere, presumably because of other constraints. The
approach to the King's Cross St Pancras Victoria Line platform from
Highbury and Islington is downhill into the platform.

I'm sure that is implied elsewhere in the text, and with the Victoria
line at KX being the 4th or 5th pair of tunneled tracks I guess there
would be many problems for the routeing of the tunnels past existing
infrastructure.

Indeed.

--
Colin Rosenstiel