We are currently engaged in replacing and upgrading all of the permanent way. The track is currently constructed of various weights of flat bottomed rail which is spiked to ex BR sleepers which have been cut in to smaller sections.
We are upgrading all of the existing rail to 25lb rail, purchased from the Romney Hythe and Dymchurch Railway. The rail is spiked to new treated Douglas Fir sleepers (900mm * 150mm * 100mm), the track panels sit on a minimum of 100mm of 40mm clean stone ballast which in turn sits on a geo-textile membrane. This membrane allows water to drain away and prevents the ballast from mixing with the sub soil. The rail joints are all coated with P-Way grease before the fishplates are fixed in place.
We have recently purchased a tilting rotary laser level so we can accurately set out the gradients. We have used the level to gradient profile the kitchen garden bend and it worked extremely well.
Over the next few years we will be replacing 100m of track in the field, rebuilding the Y section and station to move the Y section into the field and decrease the radius in the bends, putting the second track into the station and adding the turntable. We know this is quite a big project!