Bombardier, the manufacturer of many of Blackpool's trams issues serious warning to Blackpool Transport bosses
Tram bosses have reassured passengers that safety is their "top priority" after being given until June 19 to carry out urgent repairs.
The manufacturer of many of Blackpool's trams says they must be maintained regularly to ensure safety.
Blackpool's tramway rolling stock was manufactured by Bombardier - which is now part of Alstom - at its sites in Germany and Austria between 2010 and 2017.
Now Blackpool Transport - which operates the trams - has been ordered to carry out urgent repairs after an inspection by the Office of Rail and road (ORR).
The ORR's report says the company had "failed to take, so far as is reasonably practicable, appropriate measures to control known risks associated with bogie degradation".
Bogie degradation is where the axles of trams and trains become worn during years of use due to vibrations.
Inspector Lyndsay Pyke said some of the resort's trams could be at risk of "derailment or collision", if the problem was not fixed.
Blackpool Transport has until June 19 to carry out repairs to the Office of Rail and Road's satisfaction.
Now manufacturers Alstom has emphasised the importance of regular maintenance.
A spokesman said: "We are not aware of any specific risks associated with bogies produced by us.
"But, in general, they are subject to continuous wear, stress and environmental exposure, and must be maintained within strict intervals to preserve safety and reliability.
"With other customers - such as Nottingham Express Transit - we offer servicing and maintenance, however, Blackpool Transport does theirs in-house."
Tram bosses have reassured passengers that safety is their "top priority" after being given until June 19 to carry out urgent repairs.
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A spokesman for Blackpool Transport said: "Working closely with the ORR, we have already made improvements to our maintenance reporting processes, primarily, the way risks and associated mitigation measures are documented.
"While the improvement notice identified shortcomings in documentation associated with some specific repairs, we would like to assure customers that safety has always been our top priority, with appropriate measures put in place to address any potential risks.
"We will also continue to work with the ORR, suppliers, industry partners and other key stakeholders to ensure trams remain one of the safest forms of public transport."
Trams are still running on all routes, but last month a revised timetable with a slower service was introduced.
The timetable changes, from May 17, were introduced to deliver a more "robust service" for passengers.
The 15-minute Starr Gate to Fleetwood service now takes longer with additional time added to allow trams to run "more reliably".