Model Railway Forum

Hello everyone - hope you've all had a modeltastic Christmas. A bit of help please. I model in OO gauge and want to build a single track stone underbridge. I found Melcalfe's dimensions but the arch seems a bit wide at 122mm. Does anyone know the average dimension of the bottom of an arch i.e. across the track? Any help will be gratefully received.

You can always adapt the Metcalfe to fit. I guess they are as wide as is necessary to take the track and fit the location. Can’t imagine there is a standard size.

Thank you WTD.

I have the Metacalfe viaduct which is for single track but I adapted it to take two tracks.

All you need is a Stanley knife and a pack of Elastoplasts.

Plasters for the knife wielder Brian, not to clag the cardboard bits together.

I would think size and profile of tunnel entrances, etc were decided locally to accord with the loading gauge as presented by the road angle entering/leaving said orifice, or in the case of a viaduct the load bearing of local build materials versus the gap to be spanned.

No doubt the Engineers had a basic out of the box design which they fettled for local conditions.

Rob

If you model the B.R. period and have made a bridge or tunnel that is of a narrow nature, adding some "Limited Clearance" red and white boards will add a little realism to the scene.

Does this help?