Early in the planning stage it
was decided that the Barna Railway would require two small tunnels.
We had decided that the large conifer in the flower bed
should not be
moved as there was just enough room to allow a single track to
go around the back of it. However I needed to build a tunnel to protect the trains
as they passed behind it. The second tunnel would be built at the
corner of the
shed to conceal the entrance to the storage sidings which are located inside.
Both of these tunnels were
built before any track was laid to prevent the track from being
accidentally damaged by falling rocks. But a short section of track was
always on hand to test the clearances to ensure that the trains would fit through.
These two images show the
locations for the two tunnels, they were both built using the same
construction method. The following explains how the conifer tunnel
was built back in November 2006.
track bed fixed into position behind the conifer, the first job was to
trim away the leaves from the back and side, this gave
enough clearance for the framework to be installed.
As you can see from
this image there was just enough room to get the track bed
around the back of it.
The framework was constructed
using 12mm marine plywood, it is glued using a good quality
waterproof wood glue and then screwed together.
the tunnel are blocks of timber helping to support the roof. The tunnel roof will have a lot of weight placed on
it so it must be well supported.
With the tunnel frame completed
it was time to cover the plywood with some mineral felt, which
was left over from the track bed. I first painted the plywood with a
felt adhesive, which is a messy job (just look at the wall) and then stuck the
mineral felt to it.
This should give good
protection from the rain and prevent rotting.
Now it was time to start
placing the rocks around the tunnel frame, this was a tricky job to
I had plenty of rocks
to choose from so it took a while to see which rocks fitted together
The sides of the tunnel mouth
were cut with an angle grinder to get the right shape. The rock over
the tunnel mouth is held in position with stainless
steel banding which was screwed into the back of rock and to the top of
I left spaces between the rocks
which I filled with compost and planted some small conifers and rockery
Here is the finished tunnel it
only took half a day to complete but it adds a nice feature to the
railway, and keeps the trains away from danger.
the image to enlarge"
With the heavy building work
completed it was now time to get some track laid, click the track
laying link at the bottom of this page to continue.
Click on the contact me link if
you have any questions or comments.
<< Track Bed
Back to the top
© Copyright 2007-2009 Barna Railway.com