It was explained that the chain was used to pull the ride’s gondolas to the top of the structure.
“I would like to pay tribute to everyone who was on the scene, from our own staff to members of the public and, of course, the emergency services for their incredible response.”
Douglas Taylor, a director of M&D’s, said: “Our thoughts are with the people who have been injured and their families. We hope everyone makes a full recovery.
“There were lots of glitches. It should be a smooth ride but it kept jumping and when it was making its way up the hill, it stopped for about a minute or a minute and a half.
M&D’s theme park have seen eight incidents since 2011 involving potentially dangerous equipment failures. None resulted in prosecution.
M&D’s bosses said the ride was closed on Saturday due to a “minor electrical fault”.
An investigating officer photographs the crashed ride near Strathclyde Park, North Lanarkshire
Police and the Health and Safety Executive examine the scene of the crash at M&D’s theme park
“The engineers were working on the tops of the rollercoasters and seemed to be replacing a few parts.
An insider at the park, in Motherwell, claims staff had run tests on the coaster using water drums instead of people, the reported .
“We are devastated as both a family and a business, and our heart goes out to everyone who has been affected by the accident.
“Then, on Saturday, it was closed again. They were sending the rollercoaster round with 30kg water drums in all the seats, as if they were testing the weight. They have done a lot of maintenance on the ride all week.”
Tsunami rollercoaster crash
Police remain at the site of the rollercoaster crash at M&D’s park near Strathclyde Park, Motherwell, on Sunday that has left 8 children and two adults injured,
“When I heard what happened on Sunday, I was shocked, I was ready for greetin’. My pal had been on it just minutes before it derailed.
“HSE will work very closely with colleagues in the police as the investigation unfolds.”
He added: “I don’t think the chain has anything to do with what happened but to watch the ride, people had been saying there was something not right.
“My daughters were going to go on Sunday but thankfully they changed their minds and went on Saturday instead.
Hollie Aitken was on the ride when it crashed
But they added that the rollercoaster was also shut last Tuesday, with water tanks being used as “ballast” during tests.
HSE principal inspector Barry Baker is leading the probe into the crash.
Mechanics worked on the Tsunami ride at M&D’s theme park on Saturday, the day before the incident.
Two people had legs amputated after the collision on the Smiler ride, while three others suffered life-changing injuries.
It was then moved briefly to London’s Millennium Dome, before being dismantled and transported to M&D’s in 2004.
“We have brought HSE specialists in mechanical engineering to the site this morning, to begin the process of finding out what caused the gondolas to come off the rails.
“Surely if they were running maintenance checks then it should have been sorted for the next day.”
Eight people were rescued by firefighters in March when M&D’s Tornado rollercoaster ground to a halt 20ft in the air.
Hollie and mum Joyce
Hollie, 15, visited M&D’s with her sister Chloe and said she could tell there was something wrong with the ride.
“We’re cooperating fully with the joint HSE and Police Scotland investigation. It would be inappropriate to speculate on the cause of the accident until the investigation is complete.
She said: “I went on the ride with my sister on Saturday and I could tell there was something wrong.
The Italian-built Tsunami ride was first operated in Spain and France before coming to the UK, for the Hull Fair, in October 2003.
He said: “Our thoughts are with the children and adults who have been injured in this incident and I must give praise to the emergency services and members of the public who came to their aid so quickly yesterday.
The source said: “The carriage wasn’t catching on the chain and was jamming. So they had to fix that on Tuesday.
It came as police and the Health and Safety Executive continued their probe into the cause of the accident.
A rollercoaster that crashed leaving 10 people injured – two young boys seriously – was closed TWICE in the last week for repairs, it has emerged.
“I keep thinking, ‘That could have been Hollie and Chloe injured there.’
“Every ride within the theme park is safety checked on a daily basis and undergoes a thorough independent inspection every 12 months. Tsunami had its annual independent safety inspection in early June 2016.
“When they said it got stuck on Saturday then that should’ve set alarm bells ringing.”
M&D boss Douglas Taylor
She planned to visit the theme park on Sunday but, to the relief of her mum, changed her plans to go a day earlier.
“My brother Matthew and I have been in business together for 50 years and this is the first incident of this type that we’ve ever been involved in.
In 2006, firefighters freed 18 people who were trapped upside down on a fairground ride at the park.
The park is owned and operated by brothers Matthew and Douglas Taylor.
Hollie’s mum Joyce said it reminded her of the rollercoaster crash that left five passengers seriously injured at Alton Towers last year.
“Engineers put a new chain on it and reopened the ride again on Wednesday for the schools coming in.
It was classified as “a dangerous occurrence” by the HSE.
“I thought the Alton Towers accident last year was bad but for this to happen so close to home has put me off theme parks forever.
The theme park in Motherwell
The aftermath of the crash
“The workers should have known about it. They had started doing test runs on Saturday and when we left they had a maintenance sign up.
Yesterday, an M&D’s source told the Record that engineers had to replace a chain on the Tsunami tracks earlier in the week.
Nine people had to be rescued from the Tsunami in July 2011 after they became trapped 60ft up for up to eight hours when a lift chain broke.
She said: “The whole thing has left me feeling sick.
Schoolgirl Hollie Aitken told how she was on the Tsunami when it got stuck on Saturday.
“It was jamming and jerking.”