TRIM’s confirmation means wagon manufacturers, train operating companies and wagon owners considering the AR-811 can use the existing running dynamics evaluation as part of the wagon approval process without repeating the bogie evaluation.
- Transnet Rail Infrastructure Manager (TRIM) has confirmed that the existing running dynamics evaluation of AmstedReelin’s AR-811 bogie remains valid.
- The AR-811 is the first bogie for which TRIM has issued a confirmation letter, dated 5 August 2026.
- The confirmation follows Railway Safety Regulator guidance of 2 April 2026 that TRIM continues to approve safety-critical rolling stock components affecting its network.
- The bogie was tested by Transnet Mechanical Technology against EN 14363:2005/2016 and approved for speeds of up to 100km/h and axle loads of up to 20 tonnes.
- The approval applies specifically to the AR-811 fitted with side friction pads.
- The bogie is designed for existing 34-inch wheelsets with Class D bearings, for new wagons and retrofits.
Transnet Rail Infrastructure Manager (TRIM) has confirmed that the existing running dynamics evaluation of AmstedReelin’s Cape Gauge Motion Control® AR-811 bogie remains valid, providing wagon manufacturers, train operating companies and wagon owners with an established technical basis for incorporating the bogie into rolling stock intended for operation on South Africa’s rail network.
The AR-811 is the first bogie for which TRIM has issued a confirmation letter.
In a letter dated 5 August 2026, TRIM confirmed that the original Transnet evaluation reports remain valid following the establishment of the infrastructure manager and that no repeat testing or re-issue of the evaluation is required.
The confirmation follows guidance issued by the Railway Safety Regulator (RSR) on 2 April 2026, which established that TRIM continues to approve safety-critical rolling stock components that affect the condition of its network.
The AR-811 bogie, fitted with side friction pads, underwent on-track running dynamics testing by Transnet Mechanical Technology, with its performance evaluated against EN 14363:2005/2016.
The bogie achieved acceptable running dynamics in both loaded and empty wagon conditions and was approved for in-service operation at speeds of up to 100km/h and axle loads of up to 20 tonnes.
TRIM has confirmed that the approval applies specifically to the AR-811 bogie fitted with side friction pads.
TRIM has confirmed that there is sufficient evidence to demonstrate compliance with the applicable bogie-specific requirements during an interface compliance review against specification BBD8678. The bogie carries the evidence it needs within a wagon approval.
For wagon manufacturers and operators considering the AR-811, the confirmation establishes that the existing running dynamics evaluation can be used as part of the wagon approval process without repeating the bogie evaluation.
The Cape Gauge Motion Control® AR-811 is designed for use with existing 34-inch wheelsets fitted with Class D bearings, allowing it to be considered for both new wagon construction and the retrofitting of existing rolling stock.
According to AmstedReelin, the Motion Control® bogie incorporates approximately 30% fewer components than conventional designs, with a heavy-maintenance interval of up to approximately 1.5 million kilometres. The design removes the need for re-trammelling and reset maintenance, and routine maintenance can be carried out without lifting the wagon. The Adapter Plus® steering pad is intended to improve wheel and bearing service life. The design is also intended to reduce routine maintenance requirements, wheel and track wear, and the overall operating and maintenance costs associated with freight wagon ownership.
The Motion Control® platform has been in service since 2003, with more than 800,000 bogies deployed globally, and bogies in heavy-haul service regularly accumulating more than 1.5 million kilometres. AmstedReelin says this makes Motion Control® technology the most used freight bogie in the world.
“South Africa’s operators are entering an open-access market where efficiency drives competitive rates. The Motion Control® bogie lowers the total cost of ownership — around 30% fewer components to maintain, and up to 1,5 million kilometres between heavy maintenance, which means more time sweating the asset. The ripple effect through the value chain is that train operating companies and rolling stock owners can price more attractive rates into the market,” said Reesh Naidoo, Executive Director of AmstedReelin.
The confirmation from TRIM provides a defined technical approval position for the AR-811 bogie in its side friction pad configuration, while individual wagons incorporating the design remain subject to the applicable wagon approval and network interface compliance processes.
