'Gap eliminators' proved successful in an earlier 2012 trial on two route 96 Ds, before being fitted to all D1 and D2-class trams.

In early 2013, all 59 D1 and D2-class trams had their passenger information systems upgraded to announce upcoming stops.

[18][19] The upgrade, which cost $343,000, allows announcements on all routes on which D-class trams regularly travel and their alternative deviations, informing passengers of upcoming stops and connections.

The bodies of both D1 and D2-class vehicles were found to be developing microscopic cracks in November 2006, which could lead to structural collapse in the event of an accident.

The Kaohsiung City Government built the temporary line to demonstrate the concept of light rail.