RAILWAY DAMPERS
KONI
Founded in the Netherlands in 1857 and part of ITT Inc. since 1972, KONI is a world-class specialist in damping technology. It designs and builds custom hydraulic dampers for every position on a rail vehicle: primary and secondary vertical, lateral, yaw, inter-car and anti-roll.
Its maintainable dampers are built for long service lives, and overhaul plus original-manufacturer refurbishment keep life-cycle costs low.
As KONI’s exclusive agent in Korea, Sunshine Corporation supports local customers from technical consultation through supply and after-sales service.
Why KONI
160+ years, backed by ITT
Founded 1857, part of ITT since 1972. A stable partner for the long term.
Long life, low cost per km
Endurance Line designed for 25 years and 1.2 million km between services.
OEM refurbishment
Restored to factory specification with original parts and equipment. One project extended damper life about four times.
Tailored to each vehicle
Designed per vehicle and position. Operating range −40 to +60 °C, with arctic (−50 °C) and desert versions.
Global references
SNCF, Bombardier, Siemens, Amtrak and more.
Recognised for sustainability
Railsponsible Supplier Award 2025 for extending damper life.
Products
- Primary vertical dampersVertical motion between axle and bogie
- Secondary vertical dampersVertical motion between bogie and car body
- Lateral dampersSide-to-side motion of the car body
- Yaw dampersSuppress bogie hunting at high speed
- Inter-car dampersMotion between coupled cars
- Anti-roll dampersRoll of the car body
- Spares and serviceSpare parts, overhaul tooling and kits, damper test rigs, refurbishment
Product lines
- Performance LineCost-efficient; aims to run maintenance-free until bogie overhaul.
- Endurance LineMaintainable and adjustable; designed for at least 25 years.
- Technology LineHigh-performance lateral and yaw stability, reduced weight.
KONI in Korea
KONI dampers serve a range of Korean vehicles, including the KTX-Cheongryong, KTX-Eum and KTX-Sancheon high-speed trains, Seoul Line 1 and Line 4 EMUs, and hydrogen multiple units. Sunshine supports customers from new-vehicle specification to spare parts and maintenance for fleets in service.
RAILWAY SPRINGS
HŽP
Founded in 1951 in Prostějov, Czech Republic, HŽP is a specialist maker of springs for the railway and automotive industries. It produces hot-formed coil springs and UIC-standard leaf springs for the primary and secondary suspension of high-speed trains, locomotives, metros, trams and freight wagons.
Its EN 15085-2 welding certification, Deutsche Bahn Q1/HPQ approvals and Czech Railways supplier qualification show quality that meets European national-railway standards.
Sunshine Corporation supports Korean customers with HŽP supply and specification.
Why HŽP
70+ years of railway springs
Founded 1951, with a long record in railway suspension springs.
European railway approvals
DB Q1/HPQ, Czech Railways supplier, EN 15085-2 welding.
Heavy-duty capability
Wire up to 55 mm, covering primary and secondary suspension from locomotives to high-speed trains.
High-speed proven
Primary coil springs for the French TGV V150 test train, which set the rail world speed record of 574.8 km/h in 2007.
Quality, environment, safety
ISO 9001, IATF 16949, ISO 14001, ISO 45001.
In-house testing
FEM verification, dynamic fatigue tests up to 120 kN, salt-spray corrosion tests.
Products
- Hot-formed coil springsPrimary and secondary. Wire 15–55 mm, outer diameter 101–400 mm, free length 120–700 mm
- UIC leaf springsParabolic leaf springs for wagons, 18–25 t axle load
- Locomotive springsPrimary springs and secondary springs with lateral characteristics
- Leaf-spring repairRepair instead of replacement to save cost
Vehicle types
High-speed trains, regional and suburban trains, metros, trams, locomotives, freight wagons, DMUs and EMUs
HŽP in Korea
Sunshine handles drawing review, specification, import and delivery control. HŽP coil springs are supplied through Korean builders for EMUs in Queensland, Australia, metro cars for Boston, USA, and Korean locomotives, and Sunshine proposes HŽP as a source of replacement springs for Korean fleets.
HIGH-PRESSURE GAS CYLINDERS
Chesterfield
With roots going back to 1897, Chesterfield Special Cylinders specialises in high-pressure gas containment. It has supplied the UK Royal Navy with high-pressure air storage for naval vessels since the 1930s and takes part in naval programmes in several countries.
It designs and builds to UK defence standards (Def-Stan) and international codes such as PED and ASME, and supports equipment throughout its life with re-testing and recertification.
In Korea, Sunshine handles the supply of Chesterfield cylinders and replacement parts, and arranges re-testing and recertification.
Strengths
125+ years
Founded 1897, specialised in high-pressure gas containment.
Naval references
Supplying the Royal Navy since the 1930s, with naval programmes in several countries.
Multiple codes at once
UK Def-Stan 02-317 and 02-318, PED, ASME, DNV approval.
Life-cycle support
On-site and factory re-testing and recertification extend the life of cylinders in service.
Products and services
- High-pressure air cylinders for naval vesselsHigh-pressure air storage on board
- Industrial gas storageStationary and transportable storage, including hydrogen
- Re-testing and recertificationNon-destructive testing, repair, repainting, recertification