Recliner wrote:
Basil Jet wrote:
On 27/06/2019 11:48, David Cantrell wrote:
On Tue, Jun 25, 2019 at 04:02:38PM +0100, Guy Gorton wrote:

The only links Gatehampton has with transport.London is that the
Thames is flowing towards London and the railway is running away from
Paddington! But that is my excuse for mentioning this lovely viaduct
by Brunell which was built at two diffrent times, using different
brickwork techniques, the two being attached to each other their full
length.

The Grosvenor bridges crossing the Thames outside Victoria were built
similarly, one track at a time, so that the old structure could be
replaced without having to close Victoria station.


I've always wondered if there is any advantage in having a multi-track
bridge as opposed to several single track bridges with inch gaps between
them. You'd think narrow bridges would be preferable with respect to
maintenance, and also preferable in most conceivable catastrophes, but
one wide bridge seems to be the usual choice.


Cheaper, lighter? Probably less maintenance required?



Meldon Viaduct on Dartmoor is an interesting one.
The name suggests it is a single Viaduct but it is really two built at
different dates but with a degree of integration between the two. From a
distance the combined structure looks fairly uniform but on closer
examination there are a few differences between the two.

https://www.gracesguide.co.uk/Meldon_Viaduct




GH