This class covers the supply, laying, fixing, and associated works for railway tracks, including permanent way construction, ancillary items, and related civil engineering works. It includes both permanent and temporary tracks used for construction haulage or operational railway lines.
1. Scope
Class S includes:
- Laying of rail track for main lines, sidings, yards, or temporary haulage.
- Rails of different sections (e.g., 52 kg/m, 60 kg/m).
- Sleepers (timber, steel, RCC, PSC – prestressed concrete).
- Rail fastenings and fittings (fishplates, clips, bolts, pads, anchors).
- Ballast supply and laying.
- Track alignment and tamping.
- Turnouts, crossings, and points.
- Special trackwork such as check rails, guard rails, expansion joints.
- Ancillary works like buffer stops, derailers, and stop blocks.
2. Subdivision of Items
Work in Class S is subdivided as follows:
- S.1: Rails
- Supply, transport, cutting, drilling, bending (if needed).
- S.2: Sleepers
- Timber, steel, RCC, PSC sleepers, including embedded fittings.
- S.3: Rail fastenings and fittings
- Fishplates, fishbolts, elastic rail clips (ERC), baseplates, anchors, bearing pads.
- S.4: Ballast and sub-ballast
- Quarrying, transporting, spreading, compacting ballast under sleepers.
- S.5: Track laying and alignment
- Placement of rails, sleepers, fastenings, initial gauging, leveling, tamping.
- S.6: Turnouts and crossings
- Switches, crossings, special assemblies.
- S.7: Ancillary works
- Buffer stops, expansion joints, check rails, guard rails.
- S.8: Dismantling/removal
- Lifting and removing existing track, stacking serviceable materials.
3. Method of Measurement
- Rails – measured in tonnes (t) or linear metres (m).
- Sleepers – measured by number (each) or linear metre of track laid.
- Ballast – measured in cubic metres (m³).
- Track laying – measured in linear metres (m) of completed track.
- Turnouts & crossings – measured per item (set).
- Ancillaries – measured per item or linear metre depending on type.
- Dismantling – measured in m of track or per sleeper/rail piece.
4. Item Coverage
Each item is deemed to include:
- Handling, loading, unloading, stacking, transporting, and placing.
- Cutting, drilling, and welding of rails if required.
- Fixing fasteners and adjusting gauge/level.
- Compacting ballast, initial and final tamping.
- Alignment and leveling with precision instruments.
- Testing, inspection, and acceptance procedures.
5. Notes for BOQ Preparation
- Clearly specify rail section (e.g., 60E1, 52 kg/m).
- State sleeper type and density (e.g., PSC sleepers at 1660/km).
- Mention ballast size and layer thickness (e.g., 300 mm 65 mm gauge ballast).
- For turnouts, state type (1 in 12, 1 in 8.5) and rail section.
- For dismantling works, distinguish between serviceable and unserviceable material.
- If work is for temporary haul roads/tracks, mark it separately.
6. Example BOQ Items
- S.1.1: Supply of 60 kg/m rails, unloaded at site, measured per tonne.
- S.2.1: Supply and laying of PSC sleepers, M+7 density, measured per sleeper.
- S.3.1: Supply and fixing of fishplates and bolts, measured per set.
- S.4.1: Supply, transport, and spreading of 65 mm gauge stone ballast, compacted to 300 mm thickness, measured per m³.
- S.5.1: Laying, gauging, leveling, and tamping of track with rails and sleepers, measured per metre of track completed.
- S.6.1: Supply and installation of 1 in 12 turnout assembly with fittings, measured per item.
- S.7.1: Supply and fixing of buffer stop at line end, measured per item.
- S.8.1: Dismantling existing track and stacking serviceable rails/sleepers within 200 m lead, measured per metre.
