Model Bridges for the Garden Railway

Photo 3 Grockle Creek Pony Truss copy
mvl
Plate Girder  ELM TREE RED3

 Lifting Pony Truss

Finished (4)
Finished (5)
Finished (2)

Under Beam Girder Bridge ...... and curve!

Curved Beam Bridge 025
Curved Beam Bridge 009
Curved Beam Bridge 027

This Under Beam Bridge was required for a raised section of 45mm gauge railway. However the approach to one end of the bridge was an elevated curve (LGB R3). It was requested that this should be incorporated into the overall bridge structure if possible without a dog-leg appearance.

The result was achieved by the addition of two short straight sections. These were connected to each other and the main bridge structure using sturdy sideplates bent to the appropriate angle.

The parapet rails running the full length of the bridge help to reinforce the visual effect of the curve.

Inclined Rack Railway Girder Bridge 2200mm

Inclined Bridge 2200mm 7

This project for a large indoor layout in France required an inclined bridge of at least 2200mm in length. The bridge would support a rack railway rising 400mm along its length. This converts to a gradient of 1 in 5.5 or an angle of just over 10 degrees.
Furthermore the bridge had to be constructed in short sections to make delivery to France easier.
Only one true rack railway exists in the United Kingdom, the Snowdon Mountain Railway. Its steepest sections are 1 in 5.5 although they are not carried on bridges.

It was decided to adopt the Under Beam design. The bridge would be built in four sections of 550mm to be connected with substantial plates at each join. Parapet posts to support the stainless steel wire handrails were shaped to reflect the incline and fixed at 100 degrees.

A central plate was fixed between the track plates to support the rack. The track plates were arranged to overlap the junctions between the bridge sections. The photographs do not show the diagonal cross bracing which was finally added below the deck.

Inclined Bridge 2200mm 4
Inclined Bridge 2200mm 6
Inclined Bridge 2200mm 5
Inclined Bridge 2200mm 9
Inclined Bridge 2200mm 8
Inclined Bridge 2200mm 1
Inclined Bridge 2200mm 3

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