KiwiRail bought 1970s technology when it bought new
locomotives from China, but now has an opportunity to put
matters right, one of its former long-serving senior engineers
It was "baffling" KiwiRail had ordered the type of
locomotives it did, Randall Prestidge, who worked for
KiwiRail for more than 34 years and headed the fleet
performance team until he took voluntary redundancy last
year, said yesterday.
"These locomotives [are] very similar to DX locomotive
technology of the 1970s," Mr Prestidge said.
"The amount of train weight they can pull is the same. The
traction motors which do the work are identical ...
"Once we get the bugs out of the new locomotives they will be
as good as the ones which are nearly due for replacement."
KiwiRail ordered 40 locomotives at a cost of $150 million.
The first 20 arrived in the country last year and have been
plagued by major faults.
A repair programme is under way and KiwiRail has put
production of the second batch on hold until design and
manufacture difficulties are remedied.
Repairs and brakes adjustments have also been needed on 535
Chinese-built freight wagons imported last year.
Mr Prestidge, now a Wellington-based rail engineering
consultant, said KiwiRail was stuck with the 20 locomotives,
whose problems were "bad but curable".
However, he said KiwiRail should make sure it did not buy the
same technology again.
"They are thinking old and small and not thinking into the
He said he had tried to discuss his views with KiwiRail but
"no-one wanted to listen" and he had decided to go public.
"I didn't want to be disloyal to KiwiRail. I didn't want to
bag them in public. I wanted to help.
"I'm saying they . . . must change their ways. But I know in
my heart they are not going to."
An 11-page report outlining his views was "written more in
sorrow than anger", he said.
He supplied KiwiRail with a copy yesterday.
Mr Prestidge said KiwiRail should be buying heavier-axled
locomotives capable of pulling longer trains and heavier
Locomotives should also have AC traction technology and
electronic braking systems, neither of which the Chinese
When the Chinese locomotives were ordered in 2009, there was
a significant price gap between the old DC traction
technology and AC technology.
However, the price difference now was "almost nothing", he
Installing electronic braking on new locomotives and wagons
would shave 10% of train journey times, Mr Prestidge said.
At present, New Zealand's rolling stock used a compressed air
braking system which had not significantly changed since it
was designed in the 1870s.
Electronic braking used a computer cable to send a braking
signal to all wagons at the same time.
While a "nightmare" to retrofit, the electronic system was
used extensively by other railway companies on new
locomotives and wagons, he said.
"Electronic braking is so responsive it is like driving a
"The system cuts down on the chances of a train bunching up
and derailing when the brakes are applied and means trains
can go faster into corners. It also saves fuel and transit
"But because the price tag is a wee bit higher they
[KiwiRail] haven't considered it."
Mr Prestidge said keeping up with new technology and design
changes was the key to running a financially sustainable
"Developments are opening up those possibilities - much
heavier axle loads, slightly higher transit speeds, much
longer trains, all sorts of automation.
"None of that is on the radar for KiwiRail. They are
relentlessly stuck in the 1970s and 1980s model of railway."
A KiwiRail spokeswoman said yesterday the company was always
open to exploring new technology for New Zealand rolling
stock as long as it did not affect its tight budgets and need
for timely delivery.
"The [Chinese] DL locomotives were designed specifically for
the unique nature of New Zealand rail (narrow gauge, tight
tunnels, tight curves) by a team of highly experienced and
skilled rail professionals.
"Modifications have been needed and these have been made to
the second generation DL in China.
"A prototype is currently being tested and has travelled over
25,000km without any major issues arising.
"If we are satisfied with the performance, an order for the
second tranche of 20 will be approved for delivery in 2013."
KiwiRail had seen a three-fold improvement in the performance
of the first DLs in the past three months, she said.
All 20 were on the tracks and had already notched up 2
million kilometres, while the wagons had run a total of 26