The Cholsey & Wallingford  Railway

  The Bunk Line - Home of the Cholsey and Wallingford Railway Preservation Society 

Maidenhead Canopy Reconstruction

The Maidenhead canopy was dismantled as part of the Cross Rail project and electrification of the Great Western Line.   As one of the few remaining Brunellian sheds attracted the attention of the Railway Heritage Trust (RHT). The RHT an application was successfully submitted to the RHT to fund the restoration and eventual erection at Wallingford.  

March 2020

Half of the fence panels between ourselves and Lidl have been moved, which means that we are well clear of the area needed to erect the canopy. 

The soil has also been scrapped back in readiness for ballasting the run round loop and for the groundworks for the canopy. 

We have also taken the decision to extend the platform by about 25 metres, again this is needed to allow the run-round loop to be installed through the canopy, the trench was dug out in readiness for placing in the platform fronts.

February 2020

The Waiting Room is on the move!

Despite the terrible weather there has been a lot of activity over the last few weeks at the Railway. We been moving several large items (including the Waiting Room, one of the large containers etc) in readiness for the start of the programme to erect the restored Maidenhead Canopy. 

We have also started removing some of the fence between the station and Lidl.

June 2018

We are now starting to consider the options for the final roof covering. The main issues will be cost, durability and light transmittance. Originally the canopy may have been boarded but the curvature of the pearlins suggests otherwise – maybe they were several different materials used over the years?  Do you have any photographs from over the years that may help us?

May 2018

The work has progressed well and discussion about how extensive the preparation of the wood should be before painting and whether the painting at this stage (ie before erection) should include undercoat(s) and top coat(s).

Careful examination of the remaining pieces of principle rafters has confirmed that those of one side were indeed slightly curved. It will not be possible to reproduce this curvature on the repaired structure as the damaged pieces will be held together by inset metal plates each with 20-22 countersunk bolts which will of course make the principle rafter rigid. In all over 400 such bolts will be added. The solution to this geometrical puzzle will be to allow the spandrels on the wooden upright beams of the wall to be slightly countersunk at their upper end.

Detailed measurements of the position and depth of the culvert were made and to our relief this will not interfere with the foundations needed for the Canopy wall.

April 2018

Getting one of the tie bar assemblies and principle rafters all laid out on the floor of McCurdys revealed that the geometry of the tubing that makes up the tie bars is unexpected – it is impossible to have the wall and columns vertical when the tie bar is horizontal as the principle rafter on one side is longer than on the other.

This helps to explain why the tie bars on each side of the central triangle are unequal, however it also suggests that the longer principle rafter was put under tension and distorted.

March 2018

Work continued on the repairs to the major wooden components with all the structures removed from Wallingford to McCurdy’s workshop before Easter running.

Delivery of one large I beam was taken and this was cut on site to generate two T beams that could be used to re-create one of the lattice beams that ran between each pair of columns as one of these failed to make it to Wallingford.

February 2018

Much of February was spent taking the ironwork to pieces and some interesting discoveries were made for each spandrel had 10 fixing points designed to be secured with a bolt and nut, although on some spandrels the tie bars obscured two of the fixing points and so lugs were provided to help locate the spandrel. However most of the fixings were not a nut and bolt but simply a shortened bolt hammered into the wood! Most spandrels had only two or three proper fixings! The tie bars were held together by an ingenious arrangement of two wedges and two [-shaped pieces, although a very firm way of fixing them a good blow on the end of one of the wedges broke the seal formed by numerous coats of paint and released the arrangement.

By carefully taking the various iron bosses used to hold the principle rafters at the apex and those securing the tie bars it was possible to work out the method of construction.

Volunteers started to scrape the loose paint from the inner surface of the wooden canopy wall and samples taken to try and work out how many coats of paint had been applied over the years

January 2018

The first practical step was to layout the eight panels in order to see just how extensive the repairs needed to be and to make a start on disassembling the ironwork in readiness for repairs. To do this McCurdy’s brought in their crane to allow the various parts to correctly positioned