Joining up with the FC Sud

The 'Southern' arrives in Carmen de Patagones
The Sud (or Buenos Aires Great Southern Railway as it tends to be known in Britain) reached Patagones in 1922 after a long delay at Stroeder. Strangely it approaches the station from the south-east, having come round in a big loop from the north.

The photo shows the first train arriving, double-headed and met by a large crowd. The FC Sud was British -owned, hence the Union Flag on the front engine.

Carmen de Patagones station, in rather a depressing state these days and currently served by no passenger services at all though there are periodic attempts to restart through trains to Bariloche from further north.

In the central reservation outside the station stands Beyer, Peacock 2-6-0 no. ?? Local gossip suggests that this was the very same pilot engine shown on the opening day photo above. Given that the engine has stood there for thirty years or more it is in remarkably good condition, though with the usual graffiti inside the cab.

The State Railways resolve to build a connection
At the end of the First World War the situation in Patagonia was that the three FCE broad gauge lines were operating individually, and that all thought of completing a broad gauge network had been abandoned. There were ongoing plans to link them with a narrow gauge system - considered in Chapter six.

Whilst the two southern lines would have to remain isolated, it seemed silly to leave the San Antonio line unconnected from the national network. After a long interval therefore work restarted in the 1920s not merely to complete the western end of the line as far as San Carlos de Bariloche, but also to stretch back eastwards from San Antonio towards Viedma and the FC Sud which had reached Patagones on the other side of the Rio Negro.

The route from San Antonio to Viedma was relatively easy to construct. It had to start by going west and then branching offthe Bariloche line in a big curve to the north. This took the line around the tidal bay on which San Antonio stands. From then on the line undulates across the dry plains with no noteworthy features.

By 1926 Viedma (the capital of Rio Negro province) had been reached. This remained the terminus for several years whilst the big bridge across the river was constructed. The Rio Negro is a couple of hundred metres wide even at the narrow point chosen for the bridge, and the currents can be up to 6 knots. On the north side the land rises steeply not far from the bank and the line from the north stands at about 100metres above the river level. On the south side the ground is lower and flatter. In addition the river was at that time used by sea-going sailing vessels and clearance would have to be left for their masts. The 1925 report by the FCE's new Administrator general, Dr. E. Perez, discusses the pros and cons of various locations and bridge types whilst coming down firmly in favour of a lifting rather than swinging bridge on the site first proposed (1).

Viedma station pictured in December 2000.

The line clearly had to climb from Viedma station to a sufficient height to give clearance for shipping. This meant a high level bridge from which northbound trains would then start a second sustained climb, through curving cuttings to reach the FC Sud. However, it required a massive embankment climbing east from Viedma station and curving round northwards to face the river. The obvious course of action would have been to construct the south bank embankment from material extracted from the north bank cuttings, but this would have required the bridge to be built first so it may not in fact have been the chosen strategy.

To the east of this embankment on the river bank was built a locomotive depot.

The depot behind the trees has been demolished, but the wharf constructed to land goods and fuel still stands.

The bridge was constructed of three fabricated steel spans the southernmost of which was a lifting bascule. This brought the lifting mechanism to the south side next to the loco depot, and no doubt the power was provided from the site. The whole structure was completed and opened to traffic - road and rail - in 17 December 1931.

The photo was taken from the south bank east of the bridge (downstream).

Another photo taken around the time of the bridge's completion looks northward from the top of the lifting span.

A train heads north off the bridge towards Patagones station a couple of miles away.

It seems unlikely that the lifting span was opened very often even in the early days, and it is clear that it has not been operated now for many years. Indeed even trains are now rare visitors.

A view looking south through the spans. Whilst the road is used constantly by local traffic there is now another road bridge further west and the Ruta Nacional 3 has been diverted that way.

The cabins and barriers, which once controlled road traffic when a train was due, are still more or less complete.

The bridge's nameboards are also still legible though they could do with a new coat of paint.

A recent picture looking from the waterfront park in Viedma east towards the bridge.

North of the river crossing the line enters a long curving cutting on an S-bend. This brings it to join the line from Bahia Blanca just south of Carmen de Patagones station. As implied earlier, both lines come into the station from the south-east.

Home signals at the junction. The line from the bridge comes from behind the photographer whilst the Bahia Blanca line curves in from the right. A close look at the starting signals in the distance shows that the Bahia Blanca route was clearly regarded as the mainline.

References:
1 The State Railways Patagonic Lines, a report presented to the Executive Power by the Administrator General of the State Railways, Dr Enrique S. Perez, May 1925.
 

26-5-08