Simplify the following text for a Grade 8 native English-speaking person.
Original: In January 2007 the City Class 611 prototype `` supertram '' was being tested on the tramway when it caught fire as it approached Central Pier , causing extensive damage .
Simplified: In January 2007 the City Class 611 prototype `` supertram '' was being tested on the tramway . It caught fire as it approached Central Pier .