Tight Radius System (TR31)


The Tight Radius rail-and-trolley system is designed to work as an adjustable anchorage point for fall restraint on marine vessels.

Rails are composed of straight and sections curved sections that change direction in both horizontal and vertical planes, allowing trolleys to run exceptionally smoothly around very tight radii and joints.

The system is independantly tested and conforms to EN795.2012 B/D

How does it work?

The TR31 continuous rail and trolley system allows a fully-harnessed crew member, safely tethered to the trolley, to move freely along the rail during inspection and maintenance, or when assisting in pilot transfer.

Rails can be either surface or stanchion mounted and are designed so the user never has to unhook and rehook the tether as he moves around the deck.

trolley design

Trolley Design

Strong: tested to 1200 kg (2645 lb ) 2 x MCA requirements

Compact: minimum intrusion on narrow deck and restricted work areas

Multidirectional load bearings

Anodized for maximum corrosion resistance

rail design

Rail Design

Vertical and horizontal operating planes

1.3 m unsupported span

200 mm radiused sections are standard. Straight track can be bent to a 350 mm radius or larger.

High-strength, marine grade 6061-T6 aluminum rail

Anodized for maximum protection

Counter sunk M8 fasteners for flush fitting

rail design


Trolleys and rail are available in black or clear-anodized finishes for maximum corrosion protection.

delrin roller bearings

Delrin® roller bearings

No lubrication required

Low friction

Smooth movement

Roller fully supported on both ends

Brake trolley design

Screwpin on trolley keeps it in position when not in use



Part No. Description
IN209.3M.CLEAR Straight rail section
IN211 Slice link
548 Endstops
IN210.CLEAR Trolley
IN212.CLEAR Brake trolley

” To order in black anodized aluminium, remove “.CLR or .CLEAR” from end of part number.

Rail Bends:200 mm Radius
Part No.

Horizontal bend

Part No.

Vertical outside bend 

IN203.CLEAR IN206.CLEAR 30º bend
IN205.CLEAR IN208.CLEAR 45º bend
IN204.CLEAR IN207.CLEAR 60º bend
IN201.CLEAR IN202.CLEAR 90º bend

” To order in black anodized aluminium, remove “.CLR or .CLEAR” from end of part number.

Installation and maintenance

The system can be installed either at initial build or as a retrofit.

Flush clean with fresh water and mild detergent. It is important to clean car.
Excessive build-up of grease, dirt, and salt will restrict car movement.

If you would like to discuss this product further please register your interest by contacting info@harkenindustrial.com or +44 (0)1590 689122.

Delrin is a registered trademark of E.I du Pont de Nemours and Company or its affiliates.

Product Video

Q: I already work with a rail system. Do I need additional training to work with the Harken TR31?
A: Skills learned for use with alternative rail systems are transferable. However, a short training session to familiarize yourself with the Harken system is required to ensure safe installation and working practice.

Q: Can the Harken TR31 be retrofitted?
A: Yes. The simplicity of the system means it can easily be installed at a later date.

Q: What benefits can the Harken TR31 System offer me over other rail systems?
A: The construction and materials used in the Tight Radius rail and trolley system create a stronger system with a smoother linear motion. The system is made up of anodized, one-piece aluminum components, ensuring long life with low maintenance and corrosion resistance.

HARKEN EXCEPTION: This product can be used for human suspension

You must carefully read, understand, and follow all of the warnings and instructions in the manual provided by Harken in order to avoid an accident. Never, under any circumstances, exceed the maximum rated load.