S U R L O N G R O U P / I N D U S T R I E S / R A I L & M O B I L I T Y
Built for Every Mile of Track
Rail and mobility runs on two disciplines: springs and dampers that absorb a lifetime of impact, and hydraulic systems built to stay in constant motion. Surlon Group supplies both — Surlon Durel’s engineered damping systems and Sequoia Safety Products’ hydraulic and pantograph solutions — from one integrated group.
LOOKING AHEAD
Buffers Engineered for Every Rail & Metro Fleet
Surlon Durel manufactures two families of side buffer, plus dedicated end of train impact protection, all built around the same elastomer spring system rather than conventional steel springs.
Side Buffers
STANDARD INDIAN RAILWAY TYPE
Conventional Round Buffer
The round bodied buffer long used across the Indian Railways fleet, built to the conventional IR specification for standard rolling stock.
UIC / EN 15551
Lightweight EN 15551 Buffer
Surlon Durel was the first Indian manufacturer to bring a lightweight buffer to market meeting the full UIC/EN 15551 standard, validated in Germany and rated from -40°C to +50°C without adjustment.
End of Train Impact Protection
01
CRASH BUFFERS
Mounted ahead of the coupler at the end of the train, engineered around Durel’s elastomer spring system but tuned to absorb a single large impact event rather than years of routine cycling.
02
ANTI-CLIMBER
Toothed fittings mounted at the coupling end of a coach that interlock on impact, keeping coaches in line during a collision instead of letting one override the other.
SURLON DUREL POLYMER SPRINGS
Polymer Springs Built on DUREL Technology
Surlon Durel manufactures its spring range using DUREL technology, a German company trusted worldwide for consistent performance under difficult operating conditions. Three spring types, one thermoplastic platform, built to absorb impact.
01
Buffer Springs
Fitted in side or central buffers, also used in crash buffers
ENERGY ABSORPTION
50% +
TEMPERATURE RANGE
- 60°C to + 50°C
APPLICATION
All Casing Types
02
Draft Gear Springs
Built for limited installed space and nominal stroke
ENERGY ABSORPTION
High Density
TEMPERATURE RANGE
- 60°C to + 50°C
APPLICATION
All Draw Gear
03
Springs for Coupling Systems
Combined with mechanical friction or hydraulic systems
ENERGY RATING
90 kJ+
TEMPERATURE RANGE
- 60°C to + 50°C
PROVEN LOAD
20,000 T Freight
Engineering Plastics from Surlon India
Rail Pad
Sits between rail and sleeper, absorbing vibration and insulating for track-circuit signalling.
HVN Liner
PA66 liner in the fastening system, maintaining clamp integrity with ≥11 kV/mm insulation
Elastic Ring
Polyurethane ring absorbing shock in suspension or coupling assemblies
Pulleys
Polymer sheaves guiding cables in door and tensioning systems, lighter than steel
Systems Built to Stay in Constant Motion
RAIL SAFETY & ELECTRIFICATION
Sequoia Safety Products pioneers engineering solutions for rail, metro, defence and industrial sectors, combining advanced technology with a commitment to reliability under extreme operating conditions. From pantographs and hydraulic dampers to conductor rail protection, cable safety hardware and electrification fittings, Sequoia is a trusted supplier to DMRC, Mumbai Metro and Indian Railways, delivering rugged, low maintenance components engineered for decades of service.
Pantographs for High Reach, High Speed, and Freight
Our pantographs are equipped with Auto Drop Device (ADD) and Over Reach Detection (ORD) to ensure safer, more reliable operation in high speed environments.
Application: Indian Railway locomotives, Delhi Metro coaches, customised pantographs to individual requirements
Freight Pantograph
High Reach Pantograph
High Reach Pantograph
High Speed Pantograph
Hydraulic Dampers
Hydraulic dampers are a critical component in the damping systems of passenger coaches, locomotives and metro vehicles, playing a key role in ensuring smooth dynamic performance and passenger safety. Their reliability and quality are essential for governing the stability and safety of high speed trains. Sequoia’s hydraulic dampers meet the stringent requirements for modern rail and defence applications, engineered to perform in high speed environments.
Compression and Bolt Type PG and T-Type Clamps
Sequoia Safety’s compression clamps connect copper cables of the same or varying cross sections, ensuring full current flow and optimal performance, installed using hydraulic compression tools and trusted by DMRC for heavy industrial applications. Our Parallel Groove and T Type clamps are designed to connect two parallel conductors and contact wire respectively. Application: Jumper connections, electrical connections
High Reach Pantograph
High Reach Pantograph
High Reach Pantograph
High Speed Pantograph
Open High Reach Pantograph
Cover Systems for 3rd Rail and Rapid Metro
A full conductor rail protection system for rapid metro applications, normal third rail covers, ramp covers, expansion joint covers and cable termination covers, joined and supported by a dedicated GRP/PVC cover support block system.
Normal 3rd Rail Cover
Ramp Cover
Expansion Joint Cover
Cable Termination Cover
Rail Cover
Rail Cover
Cover Support Block
Heavy Engineering Components from Surlon Engineering Solutions
Schaku Coupler
Semi-permanent coupler, CNC machined in steel and aluminium
Draft Gear
Machined housing with spring and hydraulic elements
Earthing Device
Cast and machined to RDSO spec EDTS 101