Finca ADOC Railway Diversion
TRAM Line 1 (Alicante)
EXECUTON PERIOD
TOTAL INVESTMENT OF THE WORKS (VAT INCLUDED)
Serra Grossa Tunnel
A new 1,900-metre double-track bypass through the heart of Alicante — 1,477 metres of it underground. The Serra Grossa Tunnel fundamentally changes how TRAM Line 1 connects the city, replacing the former coastal alignment with a faster, safer, fully embedded route between Sangueta and La Isleta.
Scope
Civil structures and railway works for the full bypass, centred on an open‑cut tunnel and tramway platform, plus drainage, cabling and technical buildings.
• Track superstructure
• Traction power railway installations
• Railway signalling and communications systems
• Modification of the existing SAE (Automatic Train Supervision system)
• Non‑railway installations
• Traffic signal installations
• Relocation and reinstatement of affected utilities
• Complementary works
• Management of temporary railway and road traffic arrangements
• Urban development and environmental integration
• Health and safety
The section is built as a double‑track alignment, fully embedded between the southern and northern connection points with the existing lines. It uses 54 kg/m Vignole rail mounted on an Edilon‑type elastomer system, with a concrete slab up to rail head level. Inside the tunnel, the platform is fully accessible to emergency vehicles, incorporating longitudinal drainage through two lateral channels and a concrete ditch located in the track centreline.
In the open‑air sections, drainage elements connect to the municipal sewerage system, with gullies and ditches designed to collect runoff from the platform and from the Serra Grossa catchment area draining towards the southern portal.
The overhead contact line is executed using three different systems:
• Tramway‑type flexible system in the surface section at the southern portal.
• Rigid overhead conductor rail inside the tunnel.
• Conventional flexible system in the surface section at the northern portal.
The project includes the adaptation of the remote energy control system to accommodate the new OCS configuration of the bypass.
Signalling: modified Thales interlockings at MARQ and Lucentum, adapted for the bypass and new three‑aspect signals. Train protection: ATP ZSI‑127 (Siemens) — supervising all new signals via balises, euroloops and on‑board train equipment.
Communications: full replacement of the FGV fibre‑optic backbone along the section, connected through South and North nodes, integrating all signals into the remote‑control system.
