From 2011 to 2012, the C301 cars underwent refurbishment, and were fitted with new air-conditioning, surveillance, and fire detection systems.
The original wood-style flooring was replaced with mostly white flooring, and the previously red LED in-train information systems were replaced with new LED in-train information systems.
The first 11 C301 trains also received new IGBT-VVVF propulsion systems from Bombardier Transportation in 2013.

Train set 013/014 had been previously split and modified to serve as 3-car formations on the Xinbeitou Branch Line.
When new 3-car formation C371 cars were made, train set 013/014 was subsequently re-joined and put back into normal service on Tamsui–Xinyi line.
Train set 013/014 is also equipped with IGBT-VVVF inverters.

In 2017, the latter 11 sets are fitted with IGBT-VVVF inverters, effectively retiring all GTO-VVVF inverters.
From 2011 to 2012, the C301 cars underwent refurbishment, and were fitted with new air-conditioning, surveillance, and fire detection systems. The original wood-style flooring was replaced with mostly white flooring, and the previously red LED in-train information systems were replaced with new LED in-train information systems. The first 11 C301 trains also received new IGBT-VVVF propulsion systems from Bombardier Transportation in 2013.
Train set 013/014 had been previously split and modified to serve as 3-car formations on the Xinbeitou Branch Line. When new 3-car formation C371 cars were made, train set 013/014 was subsequently re-joined and put back into normal service on Tamsui–Xinyi line. Train set 013/014 is also equipped with IGBT-VVVF inverters.
In 2017, the latter 11 sets are fitted with IGBT-VVVF inverters, effectively retiring all GTO-VVVF inverters.
Taipei Metro C301